Question: If \'COLD\' is coded as \'DPEM\', what is the code for \'WARM\'?
Options:
Correct Answer: XBSN
Solution:
Each letter is shifted by +1. \'W\' to \'X\', \'A\' to \'B\', \'R\' to \'S\', \'M\' to \'N\'.