How might a marketing manager for a manufacturer of turboprop engines used in private jet planes use the North American Industry Classification (NAICS) system to help with his marketing planning? (Points : 1) He could record the NAICS numbers for each of his firm's best customers, and then obtain lists of companies with the same NAICS numbers. He could go to a library to find the NAICS numbers for all government units, federal, state, and local. He could identify all NAICS numbers that do not reflect the classifications of his firm's customers. He could poll his field sales organization to see if his company's sales representatives know what NAICS numbers mean. He could not use the NAICS system because it is a dated concept that has no current usefulness.