An engineer recently deployed a group of 100 web servers in a cloud environment. Per the security policy, all web-server ports except 443 should be disabled. Wh...

An engineer recently deployed a group of 100 web servers in a cloud environment. Per the security policy, all web-server ports except 443 should be disabled.
Which of the following can be used to accomplish this task?

A. Application allow list B. SWG C. Host-based firewall D. VPN