Which lock(s) will be in place when a device is being swapped by Optimizer on a Symmetrix VMAX array

Which lock(s) will be in place when a device is being swapped by Optimizer on a Symmetrix
VMAX array?

A.
Back-end device lock

B.
Configuration lock

C.
Front-end device and director locks

D.
Front-end device and back-end device locks

Explanation: