Karel needs to pick up a pile of tennis balls.
Which of the following program functions solves the problem at the highest level of abstraction?
move()
move()
turn_left()
turn_left()
turn_left()
move()
take_ball()
take_ball()

move_twice()
turn_left()
turn_left()
turn_left()
move()
take_pile()

move_twice()
turn_right()
move()
take_pile()

move_to_pile()
take_pile()