Hi LoQs, welcome to the community. One of the most common fasteners to use is the structural lag screw or bolt. One such product is made by Simpson Strong Tie.These are not your usual lag bolts. These are extremely hard and designed to hold a lot of weight.
Check out the complete fastener line for the screw or bolt that meets your application.Simpson Strong Tie makes a full line of structural fasteners for the building industry.
If the inspector did not state which fastener is acceptable, you will need to check with your local building code office for your area. That way you will get the exact acceptable fastener for your city.