Please use ER Notation or Crow's foot notation to solve following question:

One way to represent students and the grades they get in

courses is to use entity sets corresponding to students, to courses, and to enrollments.

Enrollment entities form a connecting entity set between students

and courses and can be used to represent not only the fact that a student is

taking a certain course, but the grade of the student in the course. Draw an

E /R diagram for this situation, indicating weak entity sets and the keys for the

entity sets. Is the grade part of the key for enrollments?