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Two generators `S_1` and `S_2` produce water wave of equal frequency. A point P is located such that `(S_1P-S_2P)` is equal to half a wavelength. When operated alone, `S_1` produces an oscillation of amplitude 2a at P while `S_2` produces an oscillation of amplitude a. If the generators are operated in phase, which graph correctly shows the resultant oscillation at P?
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