For a shoe shine process, the following functions have been identified:

Function	Function Description
A	Clean / Brush Shoes
B	Obtain Polish
C	Open and Apply Polish
D	Buff
E	Inspect
F	Collect Payment

Select the functions that will be the responsibility of the "Customer" (all that apply):

A. Buff

B. Pay and tip

C. Approval of work done

D. Clean shoes

E. Instruction for color