Which functionality must be enabled on router A to connect two networks for translating private addresses into "legal" public addresses on a one-for-one basis?

Refer to the exhibit.

Which functionality must be enabled on router A to connect two networks for translating private addresses into "legal" public addresses on a one-for-one basis?
A . PAT
B . NAT
C . VLAN
D . GARP
E . PPP

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Answer: B