Solve the Problem $7.0$ B) $7.1$ C) $2.9$ D) $3.0$

Multiple Choice

Solve the problem.
-A rectangular board is 14 by 20 units. How far from the short side of the board will the foci be located to determine the largest elliptical tabletop?

A) $7.0$
B) $7.1$
C) $2.9$
D) $3.0$