Assume that your DBMS is using locking method for concurrency control that includes usage of exclusive$/$write lock$($X$)$ and shared$/$read lock$($S$)$ on its item to answer Q$2\mathrm{.}2-$Q$2\mathrm{.}4$

$2.$ Assume that D$,$E$,$F are database items $($variables$)$ and that T$1,$T$2,$T$3$ are transactions $,$Currently T$1$ has S lock on data item D$,$ T$2$ has a S lock on data item F$.$T$3$ has a X lock on data item E$.$ If T$1$ requests an exclusive lock on F$,$ will it be successful and which operations can T$1$ perform on F$?(2$marks$)$

$3.$ Assume that M$,$ N are database items$($variables$)$ and that T$1,$ T$2$ are transactions, Currently T$1$ has X lock on data item M$,$ T$2$ has a S lock on data item N$.$ If T$2$ requests a shared lock on M$,$ will it be successful and which operations can T$2$ perform on M$?(2$marks$)$

$4.$ Assume that D$,$E$,$F are database items $($variables$)$ and that T$4,$T$5,$T$6$ are transactions $,$Currently T$4$ has S lock on data item D$,$ T$5$ has a S lock on data item F$.$T$6$ has a X lock on data item E$.$ T$5$ requests a shared lock on F$,$ will it be successful and which operations can T$1$ perform on F$?(2$marks$)$