A) $ \hat{P}=\hat{Q} $
B) $ |\vec{P}|=|\vec{Q}| $
C) $ P\hat{Q}=Q\hat{P} $
D) $ \vec{P}+\vec{Q}=\hat{P}+\hat{Q} $
Correct Answer: D $ \vec{P}+\vec{Q}=P\hat{P}+Q\hat{Q} $
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