$31.$ Which statements regarding NAT $($Network Address Translation$)$ and PAT $($Port Address Translation$)$ are CORRECT $($More than one statement applies$)?$a$.$NAT translates a private IP $($Internet Protocol$)$ address to a public IP address and there is a one$-$to$-$one ratio of private to public addresses.b$.$PAT includes the port number which is unique for each translation so a single public IP address can be used to translate multiple private IP addresses.c$.$PAT translates a private IP address to a public IP address and there is a one$-$to$-$one ratio of private to public addresses.d$.$NAT includes the port number which is unique for each translation so a single public IP address can be used to translate multiple private IP addresses.