When attempting to connect to a vCenter Server, an administrator observes the following at the top of the vSphere Web Client:
Could not connect to one or more vCenter Server Systems:https://vCenter.corp.com:443/sdk
What three reasons could be preventing the vSphere Web Client from communicating with this vCenter Server? (Choose three.)

A.
The vCenter Server machine is not responding via the network.

B.
An incorrect entry for this vCenter Server exists in the Single Sign-On service.

C.
The SSL certificates do not match the FQDN address for the server.

D.
The Platform Services Controller is external to this vCenter Server.

E.
The DNS entry for the vCenter Server is incorrect.