A new malware spreads over UDP Port 8320 and several network hosts have been infected. A
new security administrator has determined a possible cause, and the infected machines have
been quarantined. Which of the following actions could a new security administrator take to further
mitigate this issue?

A.
Limit source ports on the firewall to specific IP addresses.

B.
Add an explicit deny-all and log rule as the final entry of the firewall rulebase.

C.
Implement stateful UDP filtering on UDP ports above 1024.

D.
Configure the firewall to use IPv6 by default.