A student sends a pulse traveling on a taut rope with one end attached to a post. What will the student observe? a. The pulse will not be reflected if the rope is free to slide up and down on the post. b. The pulse will be reflected and inverted if the rope is free to slide up and down on the post. c. The pulse will be reflected and inverted if the rope is fixed to the post. d. The pulse will not be inverted if the rope is fixed to the post.