Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
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Using only this graph of $f(x) =a(x-h) ^{2}+k$ , what are the signs of $h$ and $k$ ?

A) $h$ is positive and $k$ is negative.
B) Both are positive.
C) Both are negative.
D) $h$ is negative and $k$ is positive.