Using the university schema, fill in the blank to complete the SQL query that finds the id and name of each student who has not taken any course offered before 2017.
a) `SELECT id, name FROM students WHERE NOT EXISTS (SELECT * FROM courses WHERE year < 2017)`
b) `SELECT id, name FROM students WHERE id NOT IN (SELECT student_id FROM enrollments WHERE course_year < 2017)`
c) `SELECT id, name FROM students LEFT JOIN enrollments ON students.id = enrollments.student_id WHERE enrollments.course_year >= 2017`
d) `SELECT id, name FROM students EXCEPT SELECT student_id, student_name FROM enrollments WHERE course_year < 2017`
