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In a certain office, the human resources department reports that 60% of the employees in the office commute over an hour on average each day, and that 25% of the those employees, who commute over an hour on average each day commute by train. If an employee at the officer is selected at random, what is the probability that the employee commutes over an hour an average by train/

1. A 0.10
2. B 0.15
3. C 0.20
4. D 0.25