Who Among the Following Represents an In-House Lobbyist

Who among the following represents an in-house lobbyist?

A) Sally is a retired state official who works at local media company and provides information to local officials on policy issues relating to the media.
B) Sam volunteers at the local school and is part of the "Save Education" group and works to influence local officials on local educational policies.
C) Judy has experience in the state government and is hired by a local waste management company to influence state legislators on environmental laws.
D) David is a member of a local environmental group and works to influence state legislators on waste management issues.
E) Greg is the executive director at a realty company and has specialized information on policy issues regarding land use.