Which of the following is an NEC requirement regarding access for large-scale PV electric power...

Field-applied hazard markings must be installed, and access to the supply station is to be restricted by fencing or other adequate means.

All fencing and associated gates must have ac and dc current and voltage exposure labvels and must be electrically isolated from the solar facility.

Arc flash warning labels must be field-applied by the installer at all access points for qualified persons and at the point of the utility interconnection directory.

Access to remote isolating equipment for servicing is allowed for individual other than qualified persons when the equipment is enclosed within a secure structure.