Mathematical Science Algebra Rings & Ideals

Which of the following is true? 

1
< x, y > is not maximal ideal in z5 [x, y].
2
< 2, x, y > is maximal ideal in ℤ[x, y].
3
4x2 + 6x + 3 is not unit in z8[x].
4
All of these.

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