The question refer to the code from the GridWorld case study.

Consider the following declarations.

Actor $a=$ new Actor$()$;

Bug $b=$ new Bug$()$;

Rock $r=$ new Rock$()$;

Critter $c=$ new Critter$()$;

Consider the following lines of code.

Line $1$: int dir$1=$ c$.$getDirection$()$;

Line $2$: int dir$2=$ a$.$getDirection$()$;

Line $3$: int dir$3=$ b$.$getDirection$()$;

Line $4$: ArrayList$=r=$