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A point charge q moves from point \( P \) to \( S \) along the path \( P Q R S \) in a uniform electric field \( \vec{E} \) pointing parallel to the positive direction of the \( x \)-axis. The coordinate of the point \( P, Q, R \) and \( S \) are \( (a, b, 0),(2 a, 0,0),(a,-b, 0) \) and \( (0,0,0) \) respectively. The work done by the field - in the above process is given by the expression
\( P \)
W
- (A) qaE
(B) \( -q a E \)
(C) \( q \sqrt{\left(a^{2}+b^{2}\right)} E \)
(D) \( 3 q E \sqrt{\left(a^{2}+b^{2}\right)} \)
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