You may reduce a crackers chances of success by (choose all that apply):

A. keeping your systems up to date using a security scanner.

B. hiring competent people responsible for security to scan and update your systems.

C. using multiple firewalls.

D. using multiple firewalls and IDS.

E. None of the choices.

Explanation:

Only a small fraction of computer program code is mathematically proven, or even goes through comprehensive information technology audits or inexpensive but extremely valuable computer security audits, so it is quite possible for a determined cracker to read, copy, alter or destroy data in well secured computers, albeit at the cost of great time and resources. You may reduce a crackers chances by keeping your systems up to date, using a security scanner or/and hiring competent people responsible for security.