A plane wave is represented by
`x=1.2 sin (3 14 t + 12.56 y)`
Where x and y are distances measured along in x and y direction in meters and t is time in seconds. This wave has
A. A wavelength of 0.25 m and travels in + ve x direction
B. A wavelength of 0.25 m and travels in + ve y direction
C. A wavelength of 0.25 m and travels in - ve y direction
D. A wavelength of 0.25 m and travels in - ve x direction