The correct answer is option 4, which states that all of the above procedures can be used to treat spinal stenosis.

1. Laminoplasty: This procedure involves creating more space in the spinal canal by removing a small section of bone on the back of the vertebrae. It helps relieve pressure on the nerves and spinal cord.

2. Corpectomy: This procedure involves removing a portion of the vertebral body and adjacent intervertebral discs. It is done to decompress the spinal cord and nerves when spinal stenosis is caused by bone overgrowth or tumor.

3. Foraminotomy: This procedure involves enlarging the passageway (foramen) where the spinal nerves exit the spinal canal. It can help relieve pressure on the nerves and alleviate symptoms of spinal stenosis.

All three procedures aim to relieve pressure on the spinal cord and nerves and improve symptoms of spinal stenosis.