Go back to VCP-310 - VMware Certified Professional on VI3

Question :-

What is true about the installation of Virtual Infrastructure(VI)Web Access?
It is always installed on ESX Server and VirtualCenter.
It is optional on both ESX Server and VirtualCenter.
It is always installed on ESX Server and optional on VirtualCenter.
It is always installed on VirtualCenter and optional on ESX Server.

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