Which of the following is NOT a gatekeeper? 
A. A receptionist for a small business who opens the mail and then date-time stamps each piece before passing it on to its owner. 
B. A program director at the National Science Foundation who screens all grant applications to ensure conformity to the application criteria before forwarding them to the review board. 
C. An account executive who approves a marketing plan before it is submitted to the client. 
D. The HR director of a large university who screens all internal applicants for eligibility before sending applications to the interviewers for a specific position.