A convex mirror used for rear view an automobile has radius of curvature of 3m. If a bus is located at 6m from the mirror, then the nature of this image is

Question

$\begin{array}{1 1} (a)\; \text{virtual and enlarged} \\ (b)\; \text{real and enlarged} \\ (c)\; \text{virtual and diminished} \\ (d)\; \text{real and diminished} \end{array}$