Final answer:
A screened subnet is typically implemented to protect critical resources from unauthorized access. The most likely situation to implement a screened subnet would be with internet-facing servers.
Step-by-step explanation:
A screened subnet is typically implemented in situations where there is a need to protect critical resources from unauthorized access.
In this case, the most likely situation to implement a screened subnet would be d) Internet-facing servers.
This could include servers that host a company's website, email servers, or any other servers that are accessible from the internet.
By placing these servers in a screened subnet, organizations can add an extra layer of security by isolating them from the internal network and protecting them from potential attacks.