If a four-letter meaningful English word can be formed using the 2nd, 3rd, 5th, and 7th letters of the word 'CONTRIBUTE' when taken from the left end, which of the following will be the second letter of the word so formed from the left end? If more than one such meaningful word can be formed, mark 'Y' as your answer. If no meaningful word can be formed, mark 'Z' as your answer.