Gerber Setup Options

I have almost finished my PCB design and preparing to make Gerber files. I have some doubts related to Gerber Setup Options of Altium Designer 16.1.My first quesiton about Files->Fabrication Ouputs->Gerber Files->Drill Drawings menu. I have selected both "Plot all used drill pairs" options. Is it an important selection? The second question is in Advanced menu. I have selected both "Keep leading and trailing zeros" and "Reference to absolute origin" selections. I have read the Altium's online document related to these topics however i could not understand completely. I am sharing the images what i mentioned. My board has two layers, both smd and thorugh hole components, and 60mm x 100mm sizes. For the other Gerber Setup options, i have clicked"mm","4:3", "Embedded Apertures (RS274X)" also. Thank you so much.

• I don't think I ever made a Drill Drawing - the board shop doesn't need it. They do, however require an NC Drill File. That file is, if I recall correctly, produced by a different menu item from the Gerber photoplot files. Aug 10 '17 at 17:24
• @PeterBennett ... I didn't used to do this, but at some point board houses started asking me for a fabrication drawing which is basically a Drill Drawing, dimensions and notes on routes and cutouts etc., and other information on how the board should be made. It's worth googling "pcb fabrication drawing". I alway include one these days.
– Tut
Aug 10 '17 at 17:40

I always check the Plot all used drill pairs for both the drill drawing and drill guide because you never know when you might need it. Regarding the advanced screen I always reference to the relative origin. The relative origin is the one you can move by going to Edit --> Origin --> Set (shortcut E-O-S). I place this origin at a large mounting hole which supposedly makes it easier for the board house to reference the other holes to it. The absolute origin, if memory serves, is the bottom left-hand corner of the PCB editor window. I don't like to use this origin because it places the actual board away from it. As for the leading and trailing zeros most board houses will not care one little bit.