For T$($n$)=2*$n$*$n $+3*$n $+5$

T$($n$)$ is Big$-$Theta of n

T$($n$)$ is Big$-$Theta of n$*$n

T$($n$)$ is Big$-$Theta of n$*$n$*$log$($n$)$

Not enough information

Big Theta is both lower and upper bound meaning equal bound. The