The knee joint between the thigh and lower leg is a:

Give the location of a ball and socket joint in a human body.

The special fibrous joint occurring exclusively in the skull,which is the tightest type of joint,is:

$A$: Maximum movement is possible at the amphiarthroses joint.
$R$: Such joints are also called synovial joints and have almost frictionless movement due to synovial fluid.

The joint present in the human neck is

True joints are known as: