The outer end of a control arm is attached to the steering knuckle through a Ball joint
Step-by-step explanation:
A. Bushing:
- It is a rubber
- A type of vibration isolator
- An interface between two parts
B. Spring:
- Simply spring can expand and can create jumping effect.
- It is also used to suspend the Tyre of a car.
C. Ball joint:
- This is a spherical bearing
- In automobiles, it connects control arm to the steering knuckle
D. Tie rod end:
- It allows the vehicle to steer.
- Done by connecting wheels of vehicle with steering and suspension components