Solve the Problem $x ^ { 2 } = 26.4 y$

Solve the problem.
-A 20-in. satellite dish for a television has parabolic cross sections. A coordinate system is chosen so that the vertex of a cross section through the center of the dish is located at (0, 0) . The equation of
The parabola is modeled by $x ^ { 2 } = 26.4 y$ where x and y are measured in inches. Where should the
Receiver be placed to maximize signal strength? That is, where is the focus?

A) Focus: (0, 6.4) ; Place the receiver 6.4 in. above the center of the dish.
B) Focus: (0, 6.6) ; Place the receiver 6.6 in. above the center of the dish.
C) Focus: (0, 13.2) ; Place the receiver 13.2 in. above the center of the dish.
D) Focus: (0, 12.8) ; Place the receiver 12.8 in. above the center of the dish.