Which of the following correctly states the converse of the isosceles property of a triangle?
a) If two sides of a triangle are equal, the angles opposite those sides are equal.
b) If two angles of a triangle are equal, the sides opposite those angles are equal.
c) If two sides of a triangle are equal, the triangle is right-angled.
d) If two sides of a triangle are unequal, the angles opposite those sides are equal.