Choose the correct frequency for every line as well as the total $O$ of the following code:

int sum $=0$;

for $($int $j=n-1$;$jn-1-i$;$j--=i+$jni$=0$;$i$

QUESTION $2$

Line $2$ :

A$)2n+2$

B$)n^2+1$

C$)log(n+1)$

D$)n\frac{n+3}{2}$

E$)$ None

QUESTION $3$

Line $3$ :

A$)n^2\frac{n^2+1}{2}$

B$)2n^2\frac{n^2+2}{2}$

C$)n^2+n^2\frac{n^2+1}{2}$

D$)n\frac{n+1}{2}$

E$)$ None

QUESTION $4$

Line $4$ & $5$:

A$)n(n^2+1)$

B$)n^2\frac{n^2+1}{2}$

C$)2n\frac{n^2-1}{2}$

D$)n\frac{n-1}{2}$

E$)$ None

QUESTION $5$

Total $O$ :

A$)nlogn$

B$)n^2$

C$)n^3$

D$)n^4$

E$)$ None

QUESTION $6$

Question $2$ :

Choose the most appropriate answer:

$log(n^n)+n^n+2^n$ is $O()$:

A$)2^n$

B$)n^n$

C$)n!$

D$)nlogn$

E$)$ None

QUESTION $7$

$2.(\frac{n^4}{2^{log(n)}})+nlog(n^{100})$ is $O()$:

A$)n^{2}logn$

B$)n^2$

C$)nlogn$

D$)n^3$

E$)$ None