A Vulnerability That Would Allow an Unauthenticated, Remote Attacker to Originate

Multiple Choice

A vulnerability that would allow an unauthenticated, remote attacker to originate a DoS attack was found in a DHCP client implementation of a switch. Which of the following would BEST resolve the issue?

A) Verify the default passwords have been changed.
B) Upgrade to the latest firmware
C) Generate new SSH keys.
D) Review and modify the firewall rules.