VMware's ESXi Hypervisor is a Type-1 hypervisor. What does this mean?

A.	It should be placed first in your data center
B.	It runs a conventional operating system and abstracts the guest operating system from its host system.
C.	It should only be run in class 1 data centers with high availability
D.	It runs directly on the host hardware to control and manage the guest operating systems.