Mathematics Sets Set Theory and types of Sets

Which of the following is a null set?

1
{x : |x| < 1, x ∈ N}
2
{x : |x| = 5, x ∈ N}
3
{x : x2 + 2x + 1 = 0, x ∈ R}
4
{x : x2 = 1, x ∈ Z}
5
Question Not Attempted

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