Vhich of the following is a description of a pullback device?

a) Device that uses cable attached to hands which allows access to the point of operation when the slide/ram is up and automatically
withdraws hands when the slide/ram begins to descend.

b) Device with a probe or contact bar which descend a specific distance when the machine is started.

c) Device that requires simultaneous pressure by the operator to the controls, set away from the danger area, to activate the machine.

d) Device that uses cables or straps attached to the hands at a fixed point that allows movement within a specific safe area.