Nathan Has Just Finished Installing a Brand New Firewall Blocking

Multiple Choice

Nathan has just finished installing a brand new firewall blocking FTP traffic. Almost immediately after the installation, Nathan is receiving calls that everyone in the office is no longer able to access the internet. Which of the following BEST explains the reason for the outage?

A) Implicit deny is blocking all traffic, not just FTP.
B) The firewall had a built in IPS that isn't allowing traffic to go through.
C) The firewall is defective and needs to be replaced.
D) The firewall's IP address settings were improperly configured.