Which of the following statements regard...

Which of the following statements regarding an orbital is correct?
1.An orbital is a definite trajectory around the nucleus in which electron can move.
2.An orbital always has spherical trajectory.
3.An orbital is the region around the nucleus where there is a 90 -95% probability of finding all the electrons of an atom.
4.An orbital is characterized by 2 quantum numbers n and m.

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