Consider the following two statements:

P: \(\sqrt { 1+ \sin{ \theta } } =a\)

Q: \(\sin { \cfrac { \theta }{ 2 } } +\cos { \cfrac { \theta }{ 2 } } =a\)

Which of the following statements is true?

(A) P is necessary and sufficient for Q.

(B) P is necessary but not sufficient for Q.

(C) P is sufficient but not necessary for Q.

(D) P is neither necessary nor sufficient for Q.

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