Consider the following structure declarations struct stl short a[7] char c[7] 1; struct st2 t int i[2]; short a[5]; char c[2]: 1; struct st3 short a[5]; int i2]: char c[2] 1: What is the total size of the structures st1, st2 and st3? O 22, 24 and 24 O 24, 20 and 20 O 21, 20 and 20 O 22, 20 and 24 O 24, 20 and 24