If f(x,y)=ayn+(bx+c) yn-1+(dx2+ex+f) yn-2+⋯+un(x)=0…(1), is the algebraic curve of nth order then, what is the condition for the curve to be symmetric about x-axis?

• A. Only even powers of x appear in (1)
• B. Only odd powers of x appear in (1)
• C. yn-1+(dx2+ex+f) yn-2+⋯+un(x)=0…(1), is the algebraic curve of nth order then, what is the condition for the curve to be symmetric about x-axis?a) Only even powers of x appear in (1)b) Only odd powers of x appear in (1)c) Only odd powers of y appear in (1)
• D. Only even powers of y appear in (1)