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\( \operatorname{stop} \) Test
Determine the vertex form and the maximum or minimum value of the function,
\[
f(x)=2 x^{2}+8 x+3
\]
A \( f(x)=2(x+4)^{2}-13 \), the maximum value of \( f \) is -13
(B) \( f(x)=2(x+4)^{2}-13 \), the minimum value of \( f \) is -13
C \( f(x)=2(x+2)^{2}-5 \), the maximum value of \( f \) is -5
D \( f(x)=2(x+2)^{2}-5 \), the minimum value of \( f \) is -5