By default, what do you have to install on an ESX 4.x host to auto register with a VNX for
Block storage system

A.
Only Navisphere Secure CLI on the ESX host

B.
Both Unisphere Host Agent and Navisphere CLI on the ESX host

C.
Only Unisphere Host Agent on the ESX host

D.
Nothing; the host will automatically register with the VNX storage system

Explanation: