An observer moves towards a stationary source of sound with a speed `((1)/(5))`th of the speed of sound. The wavelength and frequency of the source emitted are `lamda` and f, respectively. The apparent frequency and wavelength recorded by the observer are, respectively.
A. `1.2 f, lambda`
B. `f, 1.2 lambda`
C. `0.8 f, 0.8 lambda`
D. `1.2 f, 1.2 lambda`
