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The Wechsler Adult Intelligence Scale 4 (WAIS-IV) is designed to measure different aspects of intelligence through various indices. Each of the indices assesses a specific area of cognitive functioning, providing a comprehensive overview of an individual's intellectual capabilities.

The Working Memory Index reflects the capacity to hold and manipulate information over short periods. The Perceptual Reasoning Index assesses nonverbal and fluid reasoning skills, while the Verbal Comprehension Index evaluates verbal abilities, including understanding, reasoning, and problem-solving using language.

However, the term "Fluid Reasoning Index" specifically does not exist as one of the named indices in the WAIS-IV. Instead, the measure of fluid reasoning is incorporated within the Perceptual Reasoning Index and the Verbal Comprehension Index. Thus, the reference to a stand-alone Fluid Reasoning Index is incorrect in the context of the WAIS-IV structure, making it the option that does not correspond to outputs generated by the scale.