The wave described by y = 0.25 sin (10x 2nt), where x and y are in meters and t in seconds, is a wave travelling along the: - (a) -ve x direction with frequency 1 Hz. (b) +ve x direction with frequency Hz and wavelength = 0.2 m. (c) +ve x direction with frequency 1 Hz and wavelength > = 0.2 m (d) -ve x direction with amplitude 0.25 m and wavelength = 0.2 m