Physics Gravitation Gravitational potential energy

If 'U' is the gravitational potential energy of an object at a distance 'r' from the earth, then which of the following is correct?

1
U = 0 when r > 10r
2
U = 0 when r → ∞ 
3
U = ∞ when r > 10r
4
U = ∞ when r → ∞ 

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