A set of processes changes state as shown over the interval $[0,1$ ms$].$ P$1$ has the

highest priority and P$3$ has the lowest priority. Draw a UML sequence diagram showing

the state of all the processes during this interval.

t Process states

$0$ P$1=$waiting,P$2=$waiting,P$3=$executing

$0\mathrm{.}1$ P$1=$ready

$0\mathrm{.}15$ P$2=$ready

$0\mathrm{.}2$ P$1=$waiting

$0\mathrm{.}3$ P$1=$ready, P$3=$ready

$0\mathrm{.}4$ P$1=$waiting

$0\mathrm{.}5$ P$2=$waiting

$0\mathrm{.}6$ P$3=$waiting

$0\mathrm{.}8$ P$2=$ready, P$3=$ready

$0\mathrm{.}9$ P$2=$waiting