Which of the following is responsible for the most security issues?

A.
Outside espionage

B.
Hackers

C.
Personnel

D.
Equipment failure

Explanation:
As I stated earlier in the comments, the great part of the attacks to companies
comes from the personnel. Hackers are out there and attack some targets, but should never forget
that your worst enemy can be inside of your company. Is for that that we usually implement IDS
and profundity security. It’s a very good practice to install Host based IDS to limit the ability of
internal attackers through the machines.

Another problem with personal is the ignorance, there are time that they just don’t know what they
are doing, and certainly are violating the security policy.