Find the Vertex of the Graph of the Function $f ( x ) = 4 x ^ { 2 } + 16 x + 21$

Multiple Choice

Find the vertex of the graph of the function.
- $f ( x ) = 4 x ^ { 2 } + 16 x + 21$

A) $( - 4,3 )$
B) $( 5 , - 2 )$
C) $( 3 , - 4 )$
D) $( - 2,5 )$