## Discussion Forum

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 |

Answer:pk(R1)→pk(R2) |