The set of all points, where the function \({\rm{f}}\left( {\rm{x}} \right) = \sqrt {1 - {{\rm{e}}^{ - {{\rm{x}}^2}}}} \) is differentiable, is

1
(0, ∞)
2
(-∞, ∞) 
3
(-∞, 0) ∪ (0, ∞) 
4
More than one of the above
5
None of the above

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