An administrator is performing upgrades to ESX 4.0 from existing ESX 3.x and ESX 2.x hosts.
Which of the following is true about this procedure?

A.
A direct, in-place upgrade can be performed only on ESX 3.0 and later Hosts

B.
A direct, in-place upgrade can be performed only on ESX 2.5 and later Hosts

C.
ESX 3.x and later Hosts can be upgraded, but the upgrade cannot be performed in-place

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