Answer the following question given this paragraph: Classification of Joints on the Basis of Function The functional classification divides joints into three categories: synarthroses, amphiarthroses, and diarthroses. A synarthrosis is a joint that is immovable. This includes sutures, gomphoses, and synchondroses. Amphiarthroses are joints that allow slight movement, including syndesmoses and symphyses. Diarthroses are joints that allow for free movement of the joint, as in synovial joints. Q: What category of joints is immovable? Choices: - amphiarthroses - sporozoans - diarthroses - synarthrosis A:
synarthrosis