Which of the following statements A-E about firewalls in computer networks are true?

(A) Firewalls are only available as hardware devices and only examine traffic entering a network.

(B) Firewalls allow a user to set rules for network traffic.

(C) Firewalls will automatically stop all malicious traffic.

(D) Firewalls backup all data that is transmitted around a network.

(E) Firewalls can be used to block access to certain websites.

Choose the correct answer from the options given below: