Explanation
KPIs fall under the "business" aspect of QoS, along with monitoring and measuring of events and business processes. Services, security, and applications are all core components and concepts of the "IT" aspect of QoS.

Explanation
Authentication is the process of proving whether the identity presented by a user is true and valid. This can be done through common mechanisms such as user ID and password combinations or with more secure methods such as multifactor authentication.

Explanation
Dynamic masking involves the live replacing of sensitive data fields during transactional use between the data and application layers of a service. Static masking involves creating a full data set with the sensitive data fields masked, but is not done during live transactions like dynamic masking. Active and transactional are offered as similar types of answers but are not types of masking.

The zeroing of data--or the writing of null values or arbitrary data to ensure deletion has been fully completed--is officially referred to as overwriting. Nullification, deleting, and blanking are provided as distractor terms.