Consider the relation Student (name, sex, marks), where the primary key is name, pertaining to students in a class that has at least one boy and one girl. What does the following relational algebra expression produce? (Note: r is the rename operator). The condition in join is "(sex = female ^ x = male ^ marks ≤ m)"

• A. names of girl students with the highest marks
• B. names of girl students with more marks than some boy student
• C. names of girl students with marks not less than some boy students4)
• D. names of girl students with more marks than all the boy students