Consider a university database for the scheduling of classrooms for$-$final exams. This database could be modeled as the single entity set exam, with attributes course$-$name, section$-$number, room$-$number, and time. Alternatively, one or more additional entity sets could be defined, along with relationship sets to replace some of the attributes of the exam entity set, as $$ course with attributes name, department, and c$-$number $$ section with attributes s$-$number and enrollment, and dependent as a weak entity set on course $$ room with attributes r$-$number, capacity, and building Show an E$-$R diagram illustrating the use of all three additional entity sets listed.