Correct Answer - Option 3 : dececdef
c _ cce _ fcdc _ _ ef _ _ cc _ e _
1) ecdefcde
c e c c e c f / c d c d e e f / f c c c d e e
2) eecdeefc
c e c c e e f / c d c c d e f / e e c c f e c
3) dececdef
c d c c e e f / c d c c e e f / c d c c e e f
4) fcfeefcd
c f c c e c f / c d c f e e f / e f c c c e d
Hence, dececdef is the correct answer.