A plane mirror is initially at rest. Keeping the incident beam fixed, the mirror is first rotated 5∘ clockwise and then 7∘ anticlockwise about the same axis. By what net angle and in which sense does the final reflected ray deviate from its original direction?
a) 4∘ clockwise
b) 4∘ anticlockwise
c) 24∘ clockwise
d) 2∘ anticlockwise