Amembership committee of three is formed from four eligible members. let the eligible

Amembership committee of three is formed from four eligible members. let the eligible members be represented by a, b, c, and d. the possible outcomes include s = {abc, abd, acd, bcd}.
which statements about the situation are true? check all that apply.

there are four ways to choose the committee.
there are three ways to form the committee if person d must be on it.
if seven members are eligible next year, then there will be fewer combinations.
if persons b and c must be on the committee, there are two ways to form the committee.
if persons a and c must be on the committee, then there is only one way to form the committee.