17. Let $f ( x ) = ( 1 + b 2 ) x 2 + 2 b x + 1$ and let $m ( b )$ be the minimum value of $f ( x )$. As $b$ varies, the range of $m ( b )$ is: (A) $[ 0,1 ]$ (B) $[ 0,1 / 2 ]$ (C) $[ 1 / 2,1 ]$ (D) $[ 0,1 ]$
17. Let $f ( x ) = ( 1 + b 2 ) x 2 + 2 b x + 1$ and let $m ( b )$ be the minimum value of $f ( x )$. As $b$ varies, the range of $m ( b )$ is:\\
(A) $[ 0,1 ]$\\
(B) $[ 0,1 / 2 ]$\\
(C) $[ 1 / 2,1 ]$\\
(D) $[ 0,1 ]$\\