Final answer:
The appropriate configuration for a small business with a public IP address assignment of 209.165.200.225/30 on the router's external interface is option A. It includes the necessary access-list and NAT rules for internet connectivity.
Step-by-step explanation:
The appropriate configuration for a small business that has the public IP address of 209.165.200.225/30 assigned to the external interface on the router that connects to the Internet is option: A. This option includes the necessary access-list and NAT (Network Address Translation) rules to allow internal IP addresses to access the Internet using the public IP address.
The access-list 1 permit 10.0.0.0 0.255.255.255 statement permits traffic from the internal network (10.0.0.0/8) to be translated.
The ip nat pool comp 192.0.2.1 192.0.2.8 netmask 255.255.255.240 statement defines the NAT pool range for the translation.
The ip nat inside source list 1 pool comp overload statement configures the NAT overload (or PAT - Port Address Translation) to allow multiple internal IP addresses to use the same public IP address.
The ip nat inside source static 10.0.0.5 209.165.200.225 statement sets up a static NAT translation for a specific internal IP address to be always mapped to the public IP address.
With this configuration, the small business can use the public IP address assigned to their router to connect to the Internet and allow internal IP addresses to communicate with external networks.