Two Sisters Operate a Bed and Breakfast on the Coast $\quad$

Two sisters operate a bed and breakfast on the coast of Maine. As customers make reservations they are required to pay cash in advance equal to one-half of the rate for their stay. How should the sisters account for the cash received as reservations are made? a. Cash
$\quad$$\quad$ Unearned Service Revenue
b. Cash
$\quad$$\quad$ Service Revenue
c. Unearned Service Revenue
$\quad$$\quad$ Service Revenue
d. Cash
$\quad$$\quad$ Sales Revenue