In which of the following lists of APS Action Requests is the priority correctly arranged from lowest
to highest?

A.
Wait-to-Restore, Manual Switch, Forced Switch, Lockout of Protection

B.
Wait-to-Restore, Forced Switch, Manual Switch, Lockout of Protection.

C.
Manual Switch, Wait-to-Restore, Lockout of Protection, Forced Switch.

D.
Lockout of Protection, Forced Switch, Manual Switch, Wait-to-Restore

E.
Lockout of Protection, Manual Switch, Forced Switch, Wait-to-Restore

F.
Wait-to-Restore, Manual Switch, Lockout of Protection, Forced Switch

Explanation:
1.1. Packet over SONET
Table 1 shows the priority requests from the highest (lockout) to the lowest (manual).
Table 1 APS Priority Request

Priority Priority Request
1 Lockout of protect port
2 Forced switch
3 Signal failure—low priority
4 Signal degradation—low priority
5 Manual switch