After successfully adding a new ESXi 6.x host to vCenter Server, an administrator sees it as Not Responding in
the vSphere Web Client interface a few minutes later.
If the issue is caused by a network firewall blocking traffic, which port must be opened to correct this specific
problem?

A.
443 (TCP)

B.
443 (UDP)

C.
902 (TCP)

D.
902 (UDP)