defence exam INET Mock Test Mathematics Quadratic Equations

Under which one of the following condition will the quadratic equation x2 + mx + 2 = 0 always have real roots?

1
2√3 ≤ m2 < 8
2
√3 ≤ m3 < 4
3
m2 ≥ 8
4
m2 ≤ √3
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