A client host uses IPv4 to communicate with one server and IPv6 to communicate with
another. Which of the following IPv6 coexistence features is likely at work on the host?

A.
Native IPv6

B.
Point-to-point tunnels

C.
Multipoint tunnels

D.
NAT-PT

E.
Dual stacks

Explanation:
Dual stacks means that the host runs both IPv4 and IPv6. A host must run both
if the host is to send packets of each protocol. The host may use a multipoint tunnel,
but the other three answers list features applicable to routers, but not hosts.