For the point P(3,18) and Q(8,21), find the distance d(P,Q) and the coordinates of the midpoint M of the segment PQ.
a) d(P,Q) = 5, M(5.5, 19.5)
b) d(P,Q) = 3, M(6, 20)
c) d(P,Q) = 6, M(5.5, 20)
d) d(P,Q) = 4, M(5.5, 19)