A company hires some temporary workers. On day one, the temporary employees report they are unable to connect to the network. A network technician uses a packet analysis tool and finds that many clients are continuously sending out requests for an IP address, but many of them are not receiving a response. Which of the following could be the cause of this issue?
A. Exhausted DHCP scope.
B. Untrusted SSL certificates.
C. Duplicate MAC addresses.
D. Incorrect firewall settings.