D. All of these
Feedback Observing the given message, we find that as such no definite rule of coding seems to follow. Also, whenever. A occurs in the message, C comes at the corresponding place in the particular code. This is direct coding.
LETTER GET AWAY FIRE BAKWARD MOVE SLOW
CODE BEN CDCI QHOE PCTLDCOX ZMWE VFMD
1. The code for OVER is MWEO
2. The code for DEADLY is XECXFI
3. The code for REWARD is OEDCOX
4. The code for GREAT is BOECN