$-$ Exercise $1$

$-$ The entity PERSON has three subtypes: CAMPER, BIKER, and RUNNER. A person who is one of these subtypes cannot at the same time be one of the other subtypes. Are CAMPER, BIKER, and RUNNER disjoint or overlapping subtypes?

$-$ Exercise $2$

$-$ The entity PERSON has three subtypes: EMPLOYEE, VOLUNTEER, and DONOR. at a given time a person may belong to two or more of these groups $($e$.$g$.,$ employee and donor$).$ Are EMPLOYEE, VOLUNTEER, and DONOR disjoint or overlapping subtypes?