In a certain code language if GATE is written as AGET, how will BOOK be written in the same code language?

OOBK OKBO OBKO OBOK

OBKO

(alphabets interchanged their positions) G(7) = A(1) A(1) = G(7) T(20) = E(5) E(5)  = T(20) Similarly, B(2) = O(15) O(15) = B(2) O(15) = K(11) K(11) = O(15) Thus, the answer is OBKO