What is true about this procedure?

An administrator is performing upgrades to ESXi 5.x from ESX 3.x and ESX 4.x hosts.

What is true about this procedure?

A.
A direct, in-place upgrade can be performed only on ESX 4.1 and later hosts.

B.
ESX 3.x hosts can be upgraded, but require an upgrade to 4.x before 5.x.

C.
A direct, in-place upgrade can be performed only on ESX 4.5 and later hosts.

D.
A direct, in-place upgrade can be performed only on ESX 3.5 and later hosts.