$//1$:

app.put$(\text{'}/$:green', $($req$,$ res$)=>\{...\})$;

$//2$:

app.put$(\text{'}/$color$\text{'},($req$,$ res$)=>\{...\})$;

$//3$:

app.put$(\text{'}/$color$/$:green', $($req$,$ res$)=>\{...\})$;

$//4$:

app.put$(\text{'}/$:color', $($req$,$ res$)=>\{...\})$;

Which route handler will be invoked for a PUT $/$color request if all the route handlers are defined in order from $1-4?$

$3$

$2$

$1$

$4$