A wave travelling in the +ve x -direction having displacement along y -direction as 1 m, wavelength 2 m and frequency of 1 Hz is represented by

1. A. y = (x - 2t)
2. B. y = (2 x - 2 t)
3. C. y = (10 x - 20 t)
4. D. y = (2 x + 2 t)

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