2.9 Disjoint vs. independent:  In parts (a) and (b), identify whether the events are disjoint, independent, or neither (events cannot be both disjoint and independent).
a) You and a randomly selected student from your class both earn A's in this course.

b) You and your class partner both earn A's in this course.

c) If two events can occur at the same time, they must be independent.