If it is possible to make only one meaning full English word with the second, the fourth, the fifth and the seventh letters of the word COURTESY, using each letter only once in the word, which of the following will be the third letter of that word ? If no such word can be formed, give ‘N’ as the answer and if more than one such word can be formed, give ‘M’ as the answer.

A

R

B

0

C

S

D

N

E

M