What is the benefit of deploying IPv6 in a campus network using dual stack mode?

What is the benefit of deploying IPv6 in a campus network using dual stack mode?

A.
Dual Stack Mode takes advantage of IPv6 over IPv4 tunnel within a network.

B.
IPv4 and IPv6 run alongside one another and have nodependency on each other to
function

C.
IPv4 and IPv6 share network resources.

D.
IPv6 can depend on existing IPv4 routing, QoS, security, and multicast policies.