which frame can be configured as a service bay on the right side of the TS3500 High Availability Tap

As viewed from the front of the library, which frame can be configured as a service bay on the right side of the
TS3500 High Availability Tape Library?

A.
3584-S24 frame

B.
3584-Lx3 frame

C.
3584-SC1 frame

D.
3584-HA 1 frame