i$)$ Consider the following code and Find out the what type of $2$PL locking is used:

a$)$ Lock$\_$S$($basic$)$

Lock$\_$X$($netsal$)$

Lock$\_$S$($deduct$)$

Lock$\_$X$($hra$)$

R$($Basic$)$

R$($deduct$)$

Hra$-$hra$\_$hra$*0\mathrm{.}5$

Netsal $=$ basic $-$deduct $+$hra

Unlock$($basic$)$

Unlock$($deduct$)$

W$($netsal$)$

W$($hra$)$

Commit

Unlock $($netsal$)$

Unlock$($hra$)$