An internal DNS server requires a NAT on a Cisco IOS router that is dual-homed to separate ISPs using distinct CIDR blocks. Which NAT capability is required to allow hosts in each CIDR block to contact the DNS server via one translated address? 

Answer options:

A. NAT overload
B. NAT extendable
C. NAT TCP load balancing
D. NAT service-type DNS
E. NAT port-to-application mapping

B