In trapezoid A B C D, \overline{A B} and \overline{C D} are perpendicular to \overline{A D}, with A B+C D= B C, A B<C D, and A D=7. What is A B \cdot C D ?

**Answer Choices**

A. 12

B. 12.25

C. 12.5

D. 12.75

E. 13

In trapezoid A B C D, \overline{A B} and \overline{C D} are perpendicular to \overline{A D}, with A B+C D= B C, A B<C D, and A D=7. What is A B \cdot C D ?

**Answer Choices**

A. 12

B. 12.25

C. 12.5

D. 12.75

E. 13