FAA Regulation

Yes, as long as it meets Remote ID requirements. No, it is not permitted.  Yes, it is permitted without limitations.

Visual observer. Person manipulating the controls. Remote Pilot in Command (Remote PIC). 

Remote Pilot Certificate, Registration Card, and a copy of the Completion Certificate for the Recurrent Training.  Remote Pilot Certificate and your logbook. Remote Pilot Certificate and Registration Card.

Person manipulating the controls. Visual observer. Remote Pilot in Command (Remote PIC).

make sure the UAS is within 400 feet of the control station. maintain line of sight throughout the entire process.   have a visual observer.

The Remote Pilot in Command (RPIC). The owner of the aircraft. The FAA.

ensure that the human beings who are not participating in the operation are under a covered structure or inside a non-moving vehicle. ensure the sUAS is equipped with a parachute make sure the area is closed or restricted-access.

Turn down the intensity of the light.  Look down at your controller screen to fly the drone and find the obstacle. Turn off the strobe light.

Civil and public aircraft operations. Public and military operations. Civil operations. 

The owner of the aircraft. The operator of the aircraft. The manufacturer of the aircraft.