(A) 1st letter’s position is interchanged with 3rd letter and vice versa. 2nd with 4th and vice versa.

(B) In this whole of the word is written in reverse order only, then word VIRENDRA would also be written in the reverse order and ARDNERIV would be obtained as answer.

(C) In this all the letters in word are moved two places forward. So CIVIL will be written as EKXKN.