Consider a database used to record the marks that students get in different
exams of different course offerings (sections).
a. Construct an E-R diagram that models exams as entities, and uses a
ternary relationship, for the database.
b. Construct an alternative E-R diagram that uses only a binary relationship
between students and sections. Make sure that only one relationship
exists between a particular student and section pair, yet you can represent
the marks that a student gets in different exams.