What are correct about synovial joint? 
1. Ball and socket
2.Pivot joint
3.Hinge joint
4. Cartilaginous joint

Options

A. 1,2,3 correct
B. 1,2 correct
C. 2,4 correct
D. 1,3 correct.

Answer

### Step-by-Step Solution:

1. **Understanding Synovial Joints**: Synovial joints, also known as diarthrosis, are the most movable type of joints in the body. They are characterized by the presence of a synovial capsule and synovial fluid, which lubricates the joint.

2. **Identifying Types of Synovial Joints**: There are six main types of synovial joints in the human body:
- Ball and Socket Joints
- Pivot Joints
- Hinge Joints
- Saddle Joints
- Plane Joints
- Condyloid Joints

3. **Analyzing Each Option**:
- **Option 1: Ball and Socket Joint**: This is a type of synovial joint found in the shoulder and hip. **(Correct)**
- **Option 2: Pivot Joint**: This is also a synovial joint that allows rotational movement, found between the neck vertebrae. **(Correct)**
- **Option 3: Hinge Joint**: This type of synovial joint allows movement in one direction, found in the elbow and knee. **(Correct)**
- **Option 4: Cartilaginous Joint**: This type of joint is immovable and does not have a synovial capsule or fluid. **(Incorrect)**

4. **Conclusion**: Based on the analysis, the correct options that represent synovial joints are:
- **Option 1: Ball and Socket Joint**
- **Option 2: Pivot Joint**
- **Option 3: Hinge Joint**

Thus, the correct answer is that options 1, 2, and 3 are correct regarding synovial joints.