What are two features of dual-stack? (Choose two.)

What are two features of dual-stack? (Choose two.)
A . t is implemented without excessive processing power.
B . t supports IPv4 and IPv6 traffic on the same infrastructure.
C . t allows an engineer to stack multiple Layer 2 switches to serve as a single switching unit.
D . t requires tunneling IPv6 traffic over an IPv4 infrastructure.
E . t securely routes and tunnels traffic between separate sites over the Internet.

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Answer: A,B