The differential equation of family of circles whose centre lies on x-axis, is
A. `(d^(2)y)/(dx^(2))+((dy)/(dx))^(2)+1=0`
B. `y(d^(2)y)/(dx^(2))+((dy)/(dx))^(2)-1=0`
C. `y(d^(2)y)/(dx^(2))-((dy)/(dx))^(2)-1=0`
D. `y(d^(2)y)/(dx^(2))+((dy)/(dx))^(2)+1=0`