Which instruction executes immediately after the highlighted timeout interrupt?

Application $1$

Application $2$

instruction $1$

instruction a

instruction $2$

$($timeout interrupt$)$

instruction $3$

instruction b

$($timeout interrupt$)$

instruction c

instruction $4$

$($timeout interrupt$)$

$($timeout interrupt$)$

instruction d

instruction $5$

$($timeout interrupt$)$

D

instruction b

instruction d

instruction $5$

$($timeout interrupt$)$