What would cause this issue?

A new ESXi host has been added to vCAC, but is not visible in the Infrastructure Organizer.
What would cause this issue?

A.
The ESXi host is not a member of a Provisioning Group.

B.
The vCAC Agent is not installed on the ESXi host.

C.
The vCD Agent is not installed on the ESXi host.

D.
The ESXi host is not a member of an Enterprise Group.