If $<a_{n}>$ and $\left\langle b_{n}>\right.$ be two sequences given by $a_{n}=$ $x^{2-}+y^{2}$ and $b_{n}=x^{2^{-4}}-y^{2^{-4}} \forall n \in N$, then the
value of $a_{1} a_{2} a_{3} \ldots a_{n}$ is
(A) $\frac{x+y}{b_{n}}$
(B) $\frac{x-y}{b_{n}}$
(C) $\frac{x^{2}+y^{2}}{b_{n}}$
(D) $\frac{x^{2}-y^{2}}{b_{n}}$