$($i$)$ Given the following source code where n $=$ number of data points:

for$($ int i $=0$; i $<$ n; $++$i$)\{//$ c$0*($n$+1)$

sum $+=$ i; $//$ c$1*$n

$\}$

Assign a cost to each line which will determine the cost function T$($n$)$: