Consider the following program which classifies triangles as one of a scalene, isosceles, right or equilateral triangle and computes its area. Suppose it is initially tested using the first 4 test cases provided in the following table. T5 is added to the test case and program incorrectly computes the area. Debugging reveals an error in Statement 11. It uses expression a*2 instead of a*a. Suppose the fault is corrected and new program must be rerun to verify that it produces the correct output. Recommend a regression test case to reevaluate the program. Program Code: S1: read (a, b, c); S2: class = scalene; S3: if a=b or b=a S4: class=isosceles; S5: if a*a=b*b + c*c S6: class=right; S7: if a=b=c S8 class= equilateral S9: case class of S10: right: area=b*c/2 S11: equilateral: area= a*2*sqrt(3)/4; S12: otherwise: s= (a+b+c)/2; S13: area= sqrt(s*(s-a)*(s-b)*(s-c)); end; S14: write (class, area) Test Cases:

Test Case	Input			Output
	a	b	c	Class	Area
T1	2	2	2	Equi	1.73
T2	4	4	3	Isosceles	5.56
T3	5	4	3	Right	6.00
T4	6	5	4	Scalene	9.92
T5	3	3	3	Equi	2.60 (error)