• Step 1: First two and last two alphabets are reversed and placed at the end and the beginning respectively.
| STATEMENT | STEP-1 | 
| SEVERAL TICKET COUNTERS | LAVERES TECKIT SRUNTEOC | 
| MOBILE PHONE CHARGER CONNECTED | ELBIOM ENOHP REARGHC DENNECTOC | 
| PROGRAMMABLE READ ONLY MEMORY | ELOGRAMMABRP DAER YLNO YRMOEM | 
• Step 2: In words with odd number of alphabets --- consonants are replaced with preceding alphabets and vowels are replaced with succeeding alphabets.
In words with even number of alphabets --- consonants are replaced with succeeding alphabets and vowels are replaced with preceding alphabets. In case of A the preceding alphabet is Z.
| STATEMENT | STEP-1 | STEP-2 | 
| SEVERAL TICKET COUNTERS | LAVERES TECKIT SRUNTEOC | KBUFQFR UDDLHU TSTOUDND | 
| MOBILE PHONE CHARGER CONNECTED | ELBIOM ENOHP REARGHC   DENNECTOC | DMCHNN FMPGO QFBQFGB CFMMFBSPB | 
| PROGRAMMABLE READ ONLY MEMORY | ELOGRAMMABRP   DAER YLNO YRMOEM | DMNHSZNNZCSQ   EZDS ZMON ZSNNDN | 
• Step 3: The consonants are replaced by the numeric value of each of them. For A-Z the values are from 1-26 in the increasing order. If the value is of two digits then both the digits are added until a single digit is formed. For example  -  the numerical value for S is 19. In this 1 and 9 are added and we get 10. Again 1 and 0 are added and finally we get 1 which is a single digit number. 
If a word has odd or even number of vowels then all the vowels are replaced by @ or # respectively.
| STATEMENT | STEP-1 | STEP-2 | FINAL ARRANGEMENT | 
| SEVERAL TICKET COUNTERS | LAVERES TECKIT SRUNTEOC | KBUFQFR UDDLHU    TSTOUDND | 22@6869 #4438#   212##454 | 
| MOBILE PHONE CHARGER CONNECTED | ELBIOM ENOHP   REARGHC   DENNECTOC | DMCHNN FMPGO   QFBQFGB CFMMFBSPB | 443855 6447@   8628672 364462172 | 
| PROGRAMMABLE READ ONLY MEMORY | ELOGRAMMABRP   DAER YLNO YRMOEM | DMNHSZNNZCSQ   EZDS ZMON ZSNNDN | 445818558318   @841 84@5 815545 | 
'COMPULSORY'' is the outcome from step 1, then the outcome from step 2 is "DNNQTMTZSZ" . Hence 'a' is the correct option.