Within the realm of IT security, which of the following combinations best defines risk?

A.
Threat coupled with a breach.

B.
Threat coupled with a vulnerability.

C.
Vulnerability coupled with an attack.

D.
Threat coupled with a breach of security.

Explanation:
This is the main concept, when we talk about a possible risk we always have a possible vulnerability
in the system attacked. This vulnerability can make a threat to be successful. We can say that the
level of risk can be measures through the level of vulnerabilities in our current systems and the
ability of the attackers to exploit them to make a threat successful.