Measure the following code's complexity and write down the appropriate complexity class, using "Big$-$O Notation".

If you need to include $"$n$",$ use the lowercase version. If you need to include an $"$O$",$ use the uppercase version.

If you need to represent a polynomial such as n$^$x$,$ use the caret, like so: n$^$x

Do not use spaces in your answer. They will confuse Canvas.

void doStuff$($int n$)\{$

int a $=5$;

int b $=6$;

for $($int i $=0$; i $<$ n; i$++)\{$

a $+=$ b;

b$++$;

std::cout $<<$ "Progress: $"<<$ i $<<$ endl;

for $($int j $=0$; j $<$ n; j$++)\{$

for $($int k $=0$; k $<$ n; k$++)\{$

cout $<<$ "Hello $..."<<$ i $<<"$:$"<<$ j $<<"$:$"<<$ k $<<$ endl;

$\}$

$\}$

$\}$

$\}$