Each product is in the form ax2 + bx + c.(x + 3)2 = x2 + 6x + 9(x + 4)2 = x2 + 8x + 16(x + 5)2 = x2 + 10x + 25(x + 6)2 = x2 + 12x + 36Which of the following describes the relationship between b and c?A: c is 1.5 times that of b.B: c is double b.C: c is the square of half of b.D: c is the square of b.