An observer moves towards a stationary source of sound with a speed 1/5th of the speed of sound. The wavelength and frequency of the source emitted are \[\lambda \] and \[f\] respectively. The apparent frequency and wavelength recorded by the observer are respectively [CBSE PMT 2003]

• A.            \[1.2\ f,\ \lambda \]          
• B.            \[f,\ 1.2\lambda \]
• C.            \[0.8f,\ 0.8\lambda \]       
• D.            \[1.2f,\ 1.2\lambda \]