Which represents the polynomial written in standard form?

$4 m-2 m^4-6 m^2+9$

A$9+4 m+2 m^4-6 m^2$

B$2 m^4-6 m^2-4 m+9$

C$9-6 m^2+4 m-2 m^4$

D$-2 m^4-6 m^2+4 m+9$