What is decerebrate posturing?

A. Decerebrate posturing is characterized by extension and rigidity of the arms and legs, typically indicating damage to the midbrain or pons. It reflects severe brain injury. B. Tonic-clonic seizures involve rhythmic muscle contractions but are not posturing. C. Involuntary twisting and repetitive movements describe dystonia or chorea, not decerebrate posturing. D. Uncontrolled jerking movements describe myoclonus or seizures, not decerebrate posturing.