PLEASE HELP ME What is the correct expanded form and value of 4/5?

A. 4/5+4/5+4/5=12/5

B.4/5•4/5•4/5=64/125

C. 4+4+4+4/5=12/5.

D. 5/4•5/4•5/4=125/64

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236