Which NAT keyword allows multiple inside hosts to share a single outside IP address?

The 'overload' keyword enables Port Address Translation (PAT), a form of dynamic NAT where multiple inside local IP addresses are mapped to a single inside global IP address. This is achieved by using different source port numbers for each translation, allowing many internal hosts to share one public IP address. 'Source' is used to specify the inside IP addresses to be translated. 'Static' NAT creates a one-to-one, permanent mapping between an inside local and an inside global IP address. 'Pool' is used with dynamic NAT to define a range of inside global IP addresses that can be used for translation, but it doesn't inherently allow multiple inside hosts to share a single outside IP address without also using overload.