In a certain code, VANILLA is written as XXPFNIC. How is CARPENTER written in that code?

The logic followed here is:   The letters at odd positions move ahead by 2 places. The letters at even positions move back by 3 places. Code for ‘VANILLA’ V = V +2 = X A = A - 3 = X N = N + 2 = P I = I - 3 = F L = L + 2 = N L = L - 3 = I A = A + 2 = C Code for ‘CARPENTER’ C = C + 2 = E A = A - 3 = X R = R + 2 = T P = P - 3 = M E = E + 2 = G N  = N - 3 = K T = T + 2 = V E = E - 3 = B R = R + 2 = T   The code for CARPENTER is EXTMGKVBT. Hence, the correct answer is (B).