Which of the following describes purging?

Which of the following describes purging?

A.
It is the process of cleaning nozzles and ejectors in an ink dispersion printing system.

B.
It is the process of clearing excess toner off the electrostatic surface in a laser/LED printing
system.

C.
It is the process of a vacuum preparing the print bed before the application of liquid color in a
solid/block media printing system.

D.
It is the process of eliminating waste ink produced during the printing process in an ink
dispersion printing system.