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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

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