A person posing as an employee strikes up a conversation with a legitimate employee as they walk into a secured area, in an attempt to gain access. What kind of social engineering is this?

D) tailgating

Explanation:

Tailgating entails someone gaining an unauthorised access to a restricted area by following another person.

Most times the reason for tailgating is to steal data, ideas and other form of information.

A situation where a non staff member of an organization acted to be one to a staff just to gain access to the organization is an act of tailgating.