A 2-inch diameter wet vent receives the discharge from a water closet and a lavatory on the same floor. According to the 2022 CPC, what is the minimum size required for the wet vent, and what is the exception?

• 2 inches, except for vents serving only lavatories which can be 1 1/2 inches.
• 1 1/2 inches, except for vents serving water closets which must be 2 inches.
• 1 1/4 inches, with no exceptions.
• 2 inches, except for wet vents in individual dwelling units which can be 1 1/4 inches.