Q28,p3,j15. A message 'COMPUTER NETWORK'encrypted (ignore quotes) using columnar transposition cipher with a key "layer" the encrypted message is?

A) CTTOEWMROPNRUEK
B)MROUEKCTTPNROEW
C)OEWPNRCTTUEKMRO
D)UEKPNRMROOEWCTT

Answer A.

C	O	M	P	U
T	E	R	N	E
T	W	O	R	K

Layer is of 5 length hence computer network is  written in 5  columns  horizontally. Then it is read vertically as. CTTOEWMROPNRUEK