f T $($n$)=$ n $4+7$n$2+3$n $+5,$ which of the following is true?

$($a$)$ T $($n$)=$ O$($n$2)$

$($b$)$ T $($n$)=$ O$($n$3)$

$($c$)$ T $($n$)=\backslash$Theta $($n$)$

$($d$)$ T $($n$)=($n$2)$