You work the drive through at McDonalds $($sorry about that$---$you are only $16$ in the secnario$).$ You tell your friend working at the $7/11,$ that if they give you free beer you will "hook them up$"$ next time they come into McDonalds. This is an example of

Group of answer choices

Switching costs

Professional swapping

Reciprocity

Ingratiation