You are employed as the Storage Administrator (SA) at Certkiller .com. You need to perform a Data center migration of one Symmetrix frame that supports 12 servers. Swing boxes have been installed at each site and new servers at the destination site. What is the most important release management document to develop before your first dry run?

A.
Verified back-out plan.

B.
Documented procedures.

C.
Activity and dependency schedule.

D.
Listing of roles and responsibilities.