According to 46 CFR §28.510, what is the definition of the downflooding angle?

1. A. The angle at which the vessel's maximum righting arm occurs
2. B. The angle at which the vessel's righting arm equals zero on the recovery side
3. ✓ The static angle from the intersection of the vessel's centerline and the waterline in calm water to the first opening that cannot be closed weathertight and through which downflooding can occurCorrect
4. D. The angle of heel at which the vessel's freeboard deck becomes submerged