Final answer:
The best security policy to maximize the security of a web server accessible to both external and internal clients is to implement a firewall to restrict access.
Step-by-step explanation:
The best security policy to maximize the security of a web server that needs to be accessible to both external and internal clients is to implement a firewall to restrict access to the server.
This helps to prevent unauthorized access to the server and protects it from external threats such as hacking attempts. A firewall can be configured to allow access only to specific IP addresses or within a specific network.
While other security measures like strong encryption for data transmission, regularly updating server software and patches, and implementing multi-factor authentication are also important, a firewall serves as a first line of defense against unauthorized access.