Q$7.$ Consider schedules S$3,$ S$4,$ and S$5$ below. Determine whether each schedule is strict, cascadeless, recoverable, or nonirecoverable.

S$3$: r$1($x$)$; r$2($z$)$; r$1($z$)$; r$3($x$)$ ; r$3($y$)$; w$1($x$)$; c$1$; w$3($y$)$; c$3$; r$2($y$)$; w$2($z$)$; w$2($y$)$;c$2$

S$4$: r$1($x$)$; r$2($z$)$; r$1($z$)$; r$3($x$)$; r$3($y$)$; w$1($x$)$; w$3($y$)$; r$2($y$)$; w$2($z$)$; w$2($y$)$; c$1$; c$2$; c$3$;

S$5$: r$1($x$)$; r$2($z$)$; f$3($x$)$; r$1($z$)$; r$2($y$)$; r$3($y$)$; w$1($x$)$; w$2($z$)$; w$3($y$)$; w$2($y$)$; c$3$; c$2$;

Note:

$-$ Ci in the above schedules denote commitment of transaction Ti $.$

$-$ Strict Schedule: A schedule in which transaction can neither read nor write an item Xuntil the last transaction that wrote X has committed or aborted.