How many words, can be formed from the letters of the word 'EXTRA' so that the vowels one never together?

How many words, can be formed from the letters of the word 'EXTRA'

1.	How many words, can be formed from the letters of the word 'EXTRA' so that the vowels one never together?
A.	1365
B.	1355
C.	1345
D.	1335
Answer» B. 1355