Which of these followings are true?

**A.** The graph of \(xy=0\) is a union of the \(x\)-axis and the \(y\)-axis.

**B.** If the graph of \(x^2+y^2=r\) appears on the Cartesian coordinates system, then \(r>0.\)

**C.** The graph of \(|y|=\sqrt{-2x^2+3xy}\) and \( x = c \) intersects at two points for all real values \(c\neq 0 \).

*This problem is a part of <True or False?> series.*

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