J$.$I.T$.$ is often referred to as a "pull" type of production$-$planning system. Why?

Select one:

a$.$ orders are triggered by users of parts at downstream production operations.

b$.$ production units are linked by chains or belts that literally pull production along.

c$.$ orders are released that move others through the system.

d$.$ quality production becomes the motivator for improved demand on forecasting.

e$.$ employees help $($pull$)$ other employees along at work.