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

B.
Only Unisphere Host Agent on the ESX host

C.
Only Navisphere Secure CLI on the ESX host

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