What is the value of $\lim _{x \rightarrow 0 \atop y \rightarrow 0} \frac{x y}{x^{2}+y^{2}} ?$

(A) 1

(B) -1

(C) 0

(D) Limit does not exist

What is the value of $\lim _{x \rightarrow 0 \atop y \rightarrow 0} \frac{x y}{x^{2}+y^{2}} ?$

(A) 1

(B) -1

(C) 0

(D) Limit does not exist

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