An administrator has deployed NSX within the vSphere environment, but is unable to deploy an NSX Controller. What step must be taken to resolve the issue?

A.
Register the third-party security service device or virtual appliance with NSX Manager.

B.
Deploy a distributed router and enable the High Availability option.

C.
On the NSX Manager, select Enable multicast addressing and complete the configuration.

D.
Define a data security group for all deployed virtual machine groups.