Given your answer to the prior question, how would line $4$ have been annotated?

$1$: for $($int i $=0$; i $<$ n; $++$i$)$

$2$: $\{$

$3$: a$[$i$]=0$;

$4$: for $($int j $=0$; j $<$ i; $++$j$)$

$5$: a$[$i$]+=$ j;

$6$: $\}$

$7$: for $($int i $=0$; i $<$ n; $++$i$)$

$8$: cout $<<$ a$[$i$]<<$ endl;