Which statement correctly differentiates Static NAT, Dynamic NAT, and PAT?

• A. Static NAT maps one internal IP to a fixed external IP; Dynamic NAT uses a pool; PAT multiplexes many internal addresses to a single external IP by using port numbers.
• B. Static NAT uses a pool; Dynamic NAT maps internal addresses to fixed external IPs; PAT uses multiple external IPs.
• C. Static NAT allows dynamic address assignment; Dynamic NAT translates public to private; PAT translates domain names.
• D. Static NAT uses public addresses to map to private; Dynamic NAT uses private addresses to public with no port translation.

Answer: (A)