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