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Que. Let pk(R) denotes primary key of relation R. A many-to-one relationship that exists between two relations R1 and R2 can be expressed as follows:
a. pk(R2)→pk(R1)
b. pk(R1)→pk(R2)
c. pk(R2)→R1∩R2
d. pk(R1)→R1∩R2
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