How do cross-sectional and longitudinal studies differ in terms of changes in intelligence as individuals age?

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How do cross-sectional and longitudinal studies differ in terms of changes in intelligence as individuals age? 0 a. Longitudinal studies show scores increasing into middle adulthood, especially on tests that reflect crystallized intelligence. 0 b.Cross-sectional studies show intelligence scores increasing into middle adulthood, especially on tests that reflected accumulated knowledge or expertise. O c. Longitudinal studies show intelligence peaking in early adulthood, declining in middle adulthood, and dropping steeply in late adulthood. O d.Cross-sectional studies show intelligence peaking in early adulthood and leveling off in middle and late adulthood.