Vincent's cell phone plan charges a $10.00 monthly access fee and $0.04 for each text message sent.
Which expression below represents the total monthly charge Vincent will have to pay if he sends n text messages this month?

a. 10.00 + 0.04 + n

b. 10.00 + 0.04n

c. 10.00n + 0.04

d. (10.00 + 0.04)n