The middle term in the expansion of \((x^2 + \frac{1}{x^2} + 2)^n\) is

1
\(\frac{(2n)!}{(n!)^2}\)
2
\(\frac{(2n!)}{[(\frac{n}{2})!]^2}\)
3
\(\frac{n}{[(\frac{n}{2})!]^2}\)
4
\(\frac{1.2.5..(2n + 1)}{n!}2^n\)

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