In vertical wet venting, when two wall outlet fixtures are on the same floor level with their drains connecting to the same vertical drain at different elevations, the lower fixture drain may be wet vented only if which condition is met?

• A. No other fixtures may discharge into the vertical drain above or below the two fixtures
• B. Any other fixture may discharge into that vertical drain
• C. Only above the upper fixture
• D. Only below the lower fixture

Answer: (A)