assuming Arrow side 1?

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S1: One Student can enroll at most One Course. **True**

S2: One Course can be enrolled by any number of students. **True**

S3: One Student can enroll more than One Course. **False (No At most One Either Zero or One)**

S4: One Course can be enrolled by at most one student. **False (More than One Student Can Enroll)**

Answer: A

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