What is the minimum virtual machine compatibility setting required for a virtual machine to run on a vSphere 5.5 host?

What is the minimum virtual machine compatibility setting required for a virtual machine to run on
a vSphere 5.5 host?

A.
ESXi 5.1 and later

B.
ESXi 3.0 and later

C.
ESXi 4.1 and later

D.
ESXi 3.5 and later