Alphabets from A to Z ar coded into numbers 1 to 26. A word is coded by replacing its Alphabets with number of letters in the original word as an additional numbers to the right e.g., CAT is coded as 31203, ABC as 1233 and XYZ as 2425263. The coding may result in non-unique decoding.
Which of the following codes is guaranteed to have unique decoding ?

A

12133

B

15203

C

1213214

D

None of these