Which three workflow application actions (APPACTION) can only be used in conjunction with an Escalat

Which three workflow application actions (APPACTION) can only be used in conjunction with an
Escalation and the WFASSIGNMENT object? (Choose three.)

A.
WFAUTO

B.
WFCOND

C.
WFREJECT

D.
WFINITIATE

E.
WFACCEPT

F.
WFESCALATE

Explanation: