What is the difference between a 7490 and a 7493?

• A. 7490 is a MOD-10, 7493 is a MOD-16
• B. 7490 is a MOD-16, 7493 is a MOD-10
• C. 7490 is a MOD-12, 7493 is a MOD-16
• D. 7490 is a MOD-10, 7493 is a MOD-12