There is a recommended order to powering up the IP Office 500 V2: first up the expansion modules before powering up the control unit. Why is this?
A . it is easier to start with the expansion unit at the top and then work your way down
B . All expansion units need to be powered for the control unit to discover them.
C . The expansion units may not always see the control unit if powered up last.
D . The expansion units take longer to power up.
Answer: B