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Q. |
## Choose the option that correctly explains in words, the function of the following relational algebra expression σyear≥2009 (book ⋈ borrow) |

A. | Selects all tuples from the Cartesian product of book and borrow |

B. | Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009 |

C. | Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009 |

D. | Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009 |

Answer» B. Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009 |

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