Stuart is walking past his bedroom door and accidentally slams his elbow into the door frame. The pain is sharp, immediate, and intense. The next morning his pain is a dull ache that bothers him throughout the day. The initial pain Stuart felt was caused by __________ fibers, whereas the pain he felt the next morning was caused by __________ fibers. Group of answer choices

1. slow; fast
2. large; small
3. fast; slow
4. small; large