How does a dynamic vNIC get allocated?

How does a dynamic vNIC get allocated?

A.
Dynamic vNICs are assigned to VMs in VMware vCenter.

B.
Dynamic vNICs can only be bound to the service profile through an updating template.

C.
Dynamic vNICs are bound directly to a service profile.

D.
Dynamic vNICs are assigned by binding a port profile to the service profile.