Which bone is located at the back of the skull?

The occipital bone is indeed the correct answer as it is positioned at the back of the skull, forming the posterior portion of the cranium. This bone plays a crucial role in protecting the brain and provides a point of attachment for the neck muscles. It contains the foramen magnum, where the spinal cord connects with the brain.

To provide context regarding the other options, the temporal bone is located on the sides and base of the skull, involved in forming the lower lateral aspects of the cranium. The sphenoid bone is more centrally located and helps to form the base of the skull and orbits. The parietal bones are situated on the upper sides of the skull, contributing to the roof and sides of the cranium.