- The human shoulder joint is an example of a **ball and socket** joint. ✅
- **Ball and socket joints** allow for movement in many directions. This joint type enables the shoulder's wide range of motion.

- **Fixed joints** (Option 1) are immovable. They consist of bones that are fused together, like the skull bones.

- **Pivotal joints** (Option 2) allow rotation around a single axis, like the neck joint.

- **Hinge joints** (Option 3) only allow movement in one direction, similar to a door hinge, found in knees and elbows.

**Correct Answer: Option 4 - Ball and Socket**
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