Consider the following ER design: Which of the following relational schemas most accurately captures its semantics? (a) Every course has exactly one lecturer, but not every lecturer teaches a course. (b) Every course has more than one lecturers, but not every lecturer teaches a course. (c) Every lecturer teaches one or more courses, and every course has at least one lecturer. (d) Every lecturer teaches exactly one course, and all courses have a lecturer. (e) None of the above is correct