What type of social engineering attack has Neil employed here?

Neil is an IT security consultant working on contract for Davidson Avionics. Neil has been hired to audit the network of Davidson Avionics. He has been given permission to perform any tests necessary. Neil has created a fake company ID badge and uniform. Neil waits by one of the company’s entrance doors and follows an employee into the office after they use their valid access card to gain entrance. What type of social engineering attack has Neil employed here?

A.
Neil has used a tailgating social engineering attack to gain access to the offices.

B.
He has used a piggybacking technique to gain unauthorized access.

C.
This type of social engineering attack is called man trapping.

D.
Neil is using the technique of reverse social engineering to gain access to the offices of Davidson Avionics.