Which оf the fоllоwing stаtements regаrding the аmount of suction applied to the pleural space from the pleural drainage system are true? I. the amount of negative pressure is controlled by the amount of suction from the wall vacuumII. the amount of negative pressure is usually -20 cmH2OIII. negative pressure is controlled by the depth of the water in the suction chamber in chest tube bottle systemIV. aggressive bubbling in the water seal chamber indicates suction pressure is set at the required level for evacuation to occur