What is the smallest integer $$n$$ for which the number $$\left(2^{2}-1\right)\cdot \left(3^{2}-1\right)\cdot \left(4^{2}-1\right)\cdots \left(n^{2}-1\right)$$ is the square of an integer? 
选项为:A:$$6$$  B:$$8$$  C:$$16$$  D:$$27$$  E:None of these.  请回答其中一个选项.