Which symrdf flag and operation allows new devices to be added to an active SRDF/A session without suspending the session?

Which symrdf flag and operation allows new devices to be added to an active SRDF/A session without suspending the session?
A . establish with the movepair operation
B . cons_exempt with the modifygrp operation
C . cons_exempt with the movepair operation
D . establish with the resume operation

Answer: C