Quadriplegia is defined as:

Quadriplegia refers to a condition characterized by the paralysis of all four limbs: both arms and both legs. This can result from various causes, such as spinal cord injuries, neurological disorders, or congenital conditions. Understanding that quadriplegia specifically impacts the entire body below the neck is crucial, as it distinguishes this condition from others that affect fewer limbs or only specific areas of the body. The other options describe different types of paralysis. For instance, paralysis of the legs alone refers to paraplegia, and weakness on one side of the body is often associated with hemiplegia or hemiparesis. Permanently impaired coordination relates more to motor function than specific paralysis, which does not accurately define quadriplegia. Thus, the option identifying paralysis of the arms and legs captures the essence of the condition correctly.