$\begin{array}{1 1}(A)\;(3x+1)^2+(3y)^2=a^2-b^2 \\(B)\;(3x-1)^2+(3y)^2=a^2-b^2 \\(C)\; (3x-1)^2+(3y^2)=a^2+b^2 \\(D)\;(3x+1)^2+(3y)^2=a^2+b^2 \end{array}$

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