Which of the following best describes the blood supply to joints?

Joints are fairly poorly supplied. They receive blood from branches of larger vessels surrounding the joint.
Joints are extremely vascular with multiple vessels supplying each joint.
Joints are entirely avascular.
There is limited collateral circulation around joints making it possible to stop blood flow to the lower part of a limb by bending the joint for a long time.
Joints supply blood to the muscles surrounding the joint.