Paddy has a circular fishpond in the middle of his square backyard. The fishpond has a circular stone border. The radius of the fishpond is one foot less than the radius from the center of the pond to the outer edge of the stone border. The width of Paddy's yard is 6 feet more than the diameter of the fishpond and border. Let x be the radius in feet of the fishpond. Write an expression for the area of the yard that is not taken up by the fishpond and border. A. (4−π)x^2+(24+2π)x+(36−π)
B. (4x^2+32x+64)−π(x^2+2x+1)
C. 4x^2−πx^2+32x−2πx+64−π
D. both B and C