How are arc flash and electric shock protection boundaries determined?  A. An electrically-qualified worker inputs voltage and current into a software program to determine arc flash and shock protection boundaries  B. Unqualified workers determine arc flash and shock protection boundaries as part of their on-the-job training  C. Qualified workers use NFPA 70E boundary tables or the employer's safe work practice tables to determine arc flash and shock protection boundaries  D. Manufacturers determine arc flash and shock protection boundaries for each piece of equipment