About resistor introduce in the art of electronics third edition:

Resistors are truly ubiquitous. There are almost as many types as there are applications. Resistors are used in amplifiers as loads for active devices, in bias networks, and as feedback elements. In combination with capacitors they establish time constants and act as filters. They are used to set operating currents and signal levels. Resistors are used in power circuits to reduce voltages by dissipating power, to measure currents, and to discharge capacitors after power is removed. They are used in precision circuits to establish currents, to provide accurate voltage ratios, and to set precise gain values. In logic circuits they act as bus and line terminators and as “pullup” and “pull-down” resistors. In high-voltage circuits they are used to measure voltages and to equalize leakage currents among diodes or capacitors connected in series. In radiofrequency (RF) circuits they set the bandwidth of resonant circuits, and they are even used as coil forms for inductors.

At the last line of above paragraph, I don't know how to understand forms.

Which one meaning of forms in here? Or other meaning?

1. When manufacturing inductive coils, resistors are used as molds, serving as the supporting structure for the inductor coil and helping to maintain the shape of the coil.

2. to be the thing, or one of the things, that is part of something else, often having a particular use, namely resistors is part of inductors

Maybe second meaning is wrong, especially "resistors is part of inductors", because inductors is only made from coil. However for first meaning, molds can be replace with other the shape of the coil. So I'm confused.

From the resistor introduction in The Art of Electronics third edition:

Resistors are truly ubiquitous. There are almost as many types as there are applications. Resistors are used in amplifiers as loads for active devices, in bias networks, and as feedback elements. In combination with capacitors they establish time constants and act as filters. They are used to set operating currents and signal levels. Resistors are used in power circuits to reduce voltages by dissipating power, to measure currents, and to discharge capacitors after power is removed. They are used in precision circuits to establish currents, to provide accurate voltage ratios, and to set precise gain values. In logic circuits they act as bus and line terminators and as “pullup” and “pull-down” resistors. In high-voltage circuits they are used to measure voltages and to equalize leakage currents among diodes or capacitors connected in series. In radiofrequency (RF) circuits they set the bandwidth of resonant circuits, and they are even used as coil forms for inductors.

In the last line of above paragraph, I don't know how to understand forms.

Which meaning of forms is used here, or is there another meaning?

1. When manufacturing inductive coils, resistors are used as molds, serving as the supporting structure for the inductor coil and helping to maintain the shape of the coil.

2. To be the thing, or one of the things, that is part of something else, often having a particular use, namely resistors as part of inductors.

Maybe the second meaning is wrong, especially "resistors as part of inductors", because inductors are only made from coils. For first meaning, molds can be replace with other the shape of the coil, so I'm confused.