-Nowadays, computer security comprises mainly -preventive- measures.-

A. True

B. True only for trusted networks

C. True only for untrusted networks

D. False

E. None of the choices.

Explanation:

-Nowadays, computer security comprises mainly -preventive- measures, like firewalls or an Exit Procedure. A firewall can be defined as a way of filtering network data between a host or a network and another network and is normally implemented as software running on the machine or as physical integrated hardware.-