An optician while testing the eyes find the vision of a patient to be 6/9. By this he means that
(A) The person can read the letters of 6 inches from a distance 9 m.
(B) The person can read the letters of 9 inches from 6 m.
(C) The person can read letters from 6 m which the normal eye can read from 9 m.
(D) The person can read letters from 9 m which the normal eye can read from 6 m.