In Unix shell, when command mv foo ./foo2/foo3 is executed, what happens to file foo? Assume foo is an existing file, and ./foo2 is an existing directory. A. foo is moved into ./foo2 with new name foo3 B. foo is moved into ./foo2/foo3 with same name foo Select one: O B happens O Either A and B happens, but not enough information to determine which happens O None of A and B could happen O A happens

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