Solve the problem.The expression ?r2 - 12?r + 36? describes the area occupied by the circular top of the step stool shown, where r represents the radius of the circle which makes up the part on which a person would step. The expression that describes the radius of the circular top is the difference of r and an integer. Find the expression that describes the circular top. 
A. r - 25
B. r - 5
C. r - 6
D. r - 36
Answer: C
Mathematics
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