A company requires a network appliance at their branch office that exclusively serves the purpose of securely translating private IP addresses to public ones for outbound internet traffic, without incorporating any additional security or optimization services. Which device should be implemented to meet these specific needs with the least complexity?
Intrusion Detection System/Intrusion Prevention System (IDS/IPS)
Load balancer
Network Address Translation (NAT) gateway
Unified Threat Management (UTM) device