Which one is correct? Help

Employers are required to provide guardrail, safety net, or personal fall protection systems to protect workers from falling off unprotected sides/edges of residential roofs that are feet or more above a lower level.

What should you sprinkle on cut fruits to slow the browning process? a.oil b. lemon juice or acids c.salt d.melted butter

Aclient is prescribed digoxin (lanoxin). what are contraindications/precautions for the use of digoxin (lanoxin)?