__ ball joints allow the control arms to move up and down with suspension deflection, and also let the wheel and knuckle assembly rotate for steering. a. Lubricated b. Rotation c. Suspension d. Primary

## Step 1<br />The problem is asking us to identify the type of ball joints that allow the control arms to move up and down with suspension deflection, and also let the wheel and knuckle assembly rotate for steering. The options provided are Lubricated, Rotation, Suspension, and Primary.<br /><br />## Step 2<br />We need to understand the function of each type of ball joint. Lubricated ball joints are those that have been treated with a substance to reduce friction. Rotation ball joints allow for rotational movement. Suspension ball joints allow for movement up and down with suspension deflection. Primary ball joints are the main ball joints in a system.<br /><br />## Step 3<br />Based on the description given in the problem, the correct answer is Suspension. This is because the problem specifies that the ball joints allow the control arms to move up and down with suspension deflection, which is a characteristic of suspension ball joints.