Which of the following levels of intellectual disability is NOT one of the four recognized levels?

The recognition of intellectual disability typically includes four main levels: mild, moderate, severe, and profound. Each level reflects the degree of impairment in cognitive functions and adaptive behavior.

The level labeled as "average" does not fit within this established classification system because it suggests a typical range of intellectual functioning rather than a level of disability. Individuals diagnosed with intellectual disabilities are characterized by deficits in intellectual functioning that fall significantly below the average range, which is typically measured as an IQ of 100. Therefore, "average" does not accurately describe a recognized level of intellectual disability, making it the correct choice for the question.