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Which schematic is better for keypad connection to an MCU?

I have this three keypad connection sketches, all of which i've seen in various application, and some i've also used, but i want to know if there is any advantage of one over the other. The keypad ...
3
votes
2answers
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Interfacing a keypad with a microcontroller

I am using a PIC16F877A, running at 20 MHz. I have two paralleled, 3 columns, 4 rows keypad. My setup is as follows: KR1 to KR4 are rows, KC1 to KC3 are columns, and they all go to the ...