Choose the option that correctly explains in words, the function of the following relational algebra expression year 2009 (book borrow)

• A. tSelects all tuples from the Cartesian product of book and borrow
• B. tSelects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009
• C. tSelects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009
• D. tSelects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009