How Are Physical Ports Numbered for Each I/O Module in VS6

How are physical ports numbered for each I/O module in VS6 VPLEX hardware?

A) Director-A: 0 to 3 from the top Director-B: 0 to 3 from the bottom
B) Director-A: 1 to 4 from the bottom Director-B: 1 to 4 from the top
C) Director-A: 0 to 3 from the bottom Director-B: 0 to 3 from the top
D) Director-A: 1 to 4 from the top Director-B:1 to 4 from the bottom