Which statement gives the most accurate understanding of Payroll Employment?

• The large education and health services employment base reflects labor-intensive service provision distributed across metropolitan and nonmetropolitan regions.
• BEA revisions are part of normal statistical production and make publication dates essential metadata for state-economy research.
• BLS payroll employment measures jobs on employer payrolls and therefore cannot substitute for unique worker counts, labor-force participation, income, or value added.
• The Erie Canal converted a favorable natural corridor into lower-cost transport infrastructure, reducing friction between Atlantic and interior markets.