What Purpose Does a Firewall Serve

Multiple Choice

What purpose does a firewall serve?

A) It blocks users in a network from accessing websites or other content that a network administrator has categorized as "off limits."
B) It protects users in a network from viruses or worms that might attempt to infiltrate their systems from outside the network.
C) It protects users in a network from viruses or worms that might attempt to infiltrate their systems from inside the network.
D) It keeps network users from causing damage to any of the network components due to excessive, prolonged or intense use.