Xenia is ordering a cake for her friend’s wedding. she knows that there will be 110 guests at the wedding, and she is trying to decide how large a cake to order. she has been told that each guest should get a piece of cake that is 4 inches by 4 inches. she would like to buy a tiered, square three-layer cake and is trying to decide which sizes of cakes to order. which combination of cakes should she get? the available sizes, in inches, are:

32 × 32
28 × 28
24 × 24
20 × 20
16 × 16
12 × 12
8 × 8

a. 8 × 8, 12 × 12, and 16 × 16
b. 16 × 16, 20 × 20, and 24 × 24
c. 20 × 20, 24 × 24, and 28 × 28
d. 24 × 24, 28 × 28, and 32 × 32