In a certain code language, if the word SCHOOL is coded as TBINPK, then how will the word BOOK be coded in that language?

Given: In a certain code language, if the word SCHOOL is coded as TBINPK.

Logic: Letters are +1 and -1 alternately.

For, SCHOOL - TBINPK

S + 1 = T, C - 1 = B, H + 1 = I, O - 1 = N, O + 1 = P, L - 1 = K

Similarly,

BOOK - ?

B + 1 = C, O - 1 = N, O + 1 = P, K - 1 = J

So, BOOK is coded as CNPJ.
Thus, correct option is (a).