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Consider the following schema, where the primary key fields are underlined, and the foreign keys are identified by f.k. under the field. The field stdID represents student id and crsID represents course id. Student(stdID, name, campus, email) Course(crsID, department, semester) Took(stdID, crsID, letterGrade) fik. fik. Write the following queries in relational algebra: a) Show the course id of the courses that are offered by CS department in W2021 semester. b) Show the name of all students who have taken CS3543 and earned an A grade in it