Two beams of light having intensities \( I \) and \( 4 I \) interfere to produce a fringe patter...

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Two beams of light having intensities \( I \) and \( 4 I \) interfere to produce a fringe pattern on a screen. The phase difference between the beams is \( \pi / 2 \) at point \( A \) and \( \pi \) at point \( B \). Then, the difference between the resultant intensities at \( A \) and \( B \) is
(a) \( 2 I \)
(b) \( 4 I \)
(c) \( 5 I \)
(d) \( 9 I \)
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