Question
If $p$ and $q$ are positive real numbers such that $p^{2}+q^{2}$ $=1$, then the maximum value of $(p+q)$ is $\underline{\text { [2007 }}$(A) 2(B) $1 / 2$(C) $\frac{1}{\sqrt{2}}$(D) $\sqrt{2}$
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