If x, y and z are consecutive positive integers, and x < y < z, which of the following must be true?
1. z-x = 2
2. xyz is divisible by 6
3. x+y+z divided by 3 is an integer
A/ 1 only
B/2 only
C/ 1 and 2 only
D/ 2 and 3 only
E/ 1, 2 and 3
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