Which shows the following expression using positive exponents?
[tex] \frac{xy^{-6} }{x^{-4} y^{2} } [/tex]
A. [tex] \frac{x^4}{y^2x^6y^6} [/tex]
B. [tex] \frac{xx^4}{y^2y^6} [/tex]
C. [tex] \frac{x^4}{y^2xy^6}[/tex]
D. [tex] \frac{x^4y^2}{xy^6} [/tex]

The answer is B. If anyone needs to know.