Create an ER diagram for the following situation (fields named id are identifiers): We want to model curriculum information. We want to keep track of programs, for which we have its id, and abbreviation, and a title. We also keep track of courses: for each course we keep its id, a title, the number of credit hours, zero or more course objectives. Each course belongs to zero or more programs, and a program will have one or more courses: for each of the programs a course belongs to, we record whether the course is required or elective for the program. We keep track of topics: for each topic we keep its id and title. We keep track of which course(s) cover which topic(s). Each topic is covered in one or more courses, and each course covers zero or more topics. We also keep track of how many contact hours the course includes for that topic. We also keep track of whether a course has other courses as prerequisites. Each course could have zero or more other courses as prerequisites and be a prerequisite for zero or more courses