Refer to the exhibit.

What is the purpose of the command in the NAT-PT for IPv6 implementation on a Cisco
IOS device?

A.
It defines address pool used by the IPv6 access-list.

B.
It defines the IPv4 address pool used by the NAT-PT for dynamic address mapping.

C.
It defines address pool used by the IPv4 access-list.

D.
It defines the IPv6 address pool used by the NAT-PT for dynamic address mapping.

E.
It defines the IPv4 address pool used by the NAT-PT for static address mapping

Explanation:
ipv6 nat v6v4 pool name start-ipv4 end-ipv4 prefixlength prefix-length
Example:
Device(config)# ipv6 nat v6v4 pool v4pool 10.21.8.1
10.21.8.10 prefix-length 24
Specifies a pool of IPv4
addresses to be used by NAT-PT
for dynamic address mapping.
http://www.cisco.com/c/en/us/td/docs/iosxml/ios/ipaddr_nat/configuration/15-mt/nat-15-mt-book/ip6-natpt.html