Which of the following statements are correct?

[answerhappygod]

1) It is not possible to combine two or more file opening mode in open() method.
2) It is possible to combine two or more file opening mode in open() method.
3) ios::in and ios::out are input and output file opening mode respectively.
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a) 1, 3
b) 2, 3
c) 3 only
d) 1, 2