What is the appropriate sequence of steps that the architect should follow after getting management approval to complete the process in case of such an event?

Scenario: A Citrix Architect needs to manage the disaster recovery process for a XenApp and XenDesktop environment. The environment currently consists of an active datacenter which is typically accessed by users and a disaster recovery (DR) datacenter which would be used in the event that a disaster impacts the primary datacenter. The organization has made it a priority to minimize the loss of data when failing over between datacenters and has begun planning for an event in which the environment must fail over from the primary datacenter to the DR datacenter.

What is the appropriate sequence of steps that the architect should follow after getting management approval to complete the process in case of such an event?
A . Block access to primary datacenter, complete replication, terminate/drain existing sessions, reverse direction of replication, enable access in DR datacenter
B . Block access to primary datacenter, terminate/drain existing sessions, complete replication, reverse direction of replication, enable access in DR datacenter
C . Terminate/drain existing sessions, complete replication, block access to primary datacenter, enable access in DR datacenter, reverse direction of replication
D . Complete replication, terminate/drain existing sessions, block access to primary datacenter, reverse direction of replication, enable access in DR datacenter
E . Complete replication; block access to primary datacenter, terminate/drain existing sessions, enable access in DR datacenter, reverse direction of replication
F . Terminate/drain existing sessions; block access to primary datacenter, complete replication, reverse direction of replication, enable access in DR datacenter

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Answer: D