Answer
A
Work Step by Step
Biosafety Level 3 includes double sets of entry doors. Biosafety Level 3 is stricter than BSL-2 and BSL-1. BSL-3 requires that all manipulations be done within safety cabinets containing high-efficiency particulate air filters. BSL-3 also details specific special design features for the laboratory, which includes entry through double sets of doors and ventilation that moves into the room only through an open door.
