Expression =Â PRINTING : RPNIITGN
The pattern followed is that each pair of letters starting from left is swapped, i.e. 1st and 2nd letters are swapped, 3rd and 4th, 5th and 6th and so on.
Eg = PR -> RP , IN -> NI , TI -> IT , NG -> GN
Similarly, for PR OT OC OL -> RP TO CO LO
Thus, PROTOCOL :Â RPTOCOLO
=> Ans - (D)
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