What is the definition of Availability?

A.
a record containing details of which Configuration Items (CIs) are affected and how they are
affected by an authorized Change

B.
a snapshot of the state of a service or individual Configuration Item (CI) at a point in time

C.
any event which is not part of the standard operation of a service and which causes or may
cause an interruption to, or a reduction in, the quality of that service

D.
the ability of a component or service to perform its required function at a stated instant or over a
stated period of time

Explanation:
A Incorrect. This is the definition of a Change record.
B Incorrect. This is the definition of a Baseline.
C Incorrect. This is the definition of an Incident.
D Correct. This is the definition of Availability.