What is the function of the HP Color LaserJet Enterprise CM4540 MFP scanner safety cable?

A.
prevents the ADF/scanner from falling off the back of the engine after the scissor hinges have
been removed

B.
secures the ADF to the top of the scanner assembly during service

C.
secures the intermediate paper transport unit (IPTU) to the engine under the top cover

D.
provides a safety mechanism to the back right scanner hinge to protect fingers from being
pinched in the hinge