You are given the following schedules involving three transactions $($T$1,$ T$2,$ T$3)$ performing operations on database items $($A$,$ B$,$ C$,$ D$)$: $[2$ Marks$]$

Schedule S$1$:

T$1$: R$($A$),$ R$($B$),$ W$($C$)$

T$2$: W$($A$),$ R$($B$),$ R$($C$)$

T$3$: W$($A$),$ W$($B$),$ R$($D$)$