Mathematics Three Dimensional Geometry Direction ratios and Direction cosines

What are the direction ratios of normal to the plane 2x - y + 2z + 1 = 0?

1
<2, 1, 2>
2
<1, - 1 / 2, 1>
3
<1, - 2, 1>
4
<1, 1, 2>
5
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