Inititial CPC? DCPC?

NPABU:
Hello all,
I have a quick question about the CPC. I have booked my Theory and Hazard Perception. I have also booked my Driver CPC for another date. When I have been looking at training prices they also include Module 4 CPC at an extra price. Do i also have to do Module 4 before I would be able to drive for a living or would that need done before 5 years after passing the Class 2.

I know this has probably been asked many times before but im just checking
Cheers Paul

Mod 4 must be passed to drive LGVs commercially

More info on all this is contained within the link in my signature below