## Discussion Forum

Que. | The following table has two attributes A and C where A is the primary key and C is the foreign key referencing A with on-delete cascade. A C ----- 2 4 3 4 4 3 5 2 7 2 9 5 6 4 The set of all tuples that must be additionally deleted to preserve referential integrity when the tuple (2,4) is deleted is: |

a. | (3,4) and (6,4) |

b. | (5,2) and (7,2) |

c. | (5,2), (7,2) and (9,5) |

d. | (3,4), (4,3) and (6,4) |

Answer:(5,2), (7,2) and (9,5) |