* PLEASE ANSWER TY* You can find the area of a polygon by dividing it into triangle and rectangle sub-parts and adding up their individual areas. Which of the following is one of the rules of this method? a.) You must use one rectangle and two triangles. b.) You must be able to calculate the area of the triangle and rectangle sub-parts. c.) The polygon must be a regular polygon. d.) The triangles must all be congruent.