Answer:
A. Exhausted DHCP scope.
Step-by-step explanation:
The company has many temporary workers, and permanent workers. There are many people under one network. Since, there are many workers, there can't be untrusted SSL certificates. They all have different devices or computers, so they can't both have duplicate MAC addresses. Lastly, the firewall is supposed to protect against computer viruses and other types of malware, not to harm the user and scope. So, the answer is A.