Find the Zeros of the Quadratic Function by Completing the Square

Multiple Choice

Find the zeros of the quadratic function by completing the square. List the x-intercepts of the graph of the function.
- $$F ( x ) = x ^ { 2 } + 4 x + 3$$

A) $x = \sqrt { 3 } , x = \sqrt { - 3 }$
B) $x = 6 , x = - 3$
C) $x = - 1 , x = - 3$
D) $x = 1 , x = 3$