LET's check each option.1) abdbacdb/abdbacdb/abdbacdb/abdb → follows a pattern i.e., abdbacdb.2) abdbacdb/dbdaacbb/abdbacdb/abdb → doesn't FOLLOW a pattern3) abcbaddb/abdbacdb/abdbbcdb/abda → doesn't follow a pattern4) abdbacdb/abddacbb/abdbacdb/abdb → doesn't follow a patternHence, the CORRECT answer is 'dcabdbab'.