\(\lim \sqrt {\frac{{{n^4} + 2{n^2} + {n^3} + n}}{...

Câu hỏi: \(\lim \sqrt {\frac{{{n^4} + 2{n^2} + {n^3} + n}}{{9{n^4} - {n^3}}}} \) bằng

A. \(\frac{1}{9}\)

B. \(\frac{1}{3}\)

C. \(\frac{1}{{\sqrt 3 }}\)

D. 0