Final answer:
Chondroitin sulfate is a glycosaminoglycan found in joints that binds to water to maintain fluid volume. All of the statements about chondroitin sulfate are correct.
Step-by-step explanation:
Chondroitin sulfate is a type of glycosaminoglycan (GAG) that is found in joints. It is responsible for maintaining fluid volume in the joint as it binds to water. Therefore, option 4 - all of the statements are correct.