Final answer:
The Material Safety Data Sheet (now known as Safety Data Sheets) complies with the OSHA Hazard Communication Standard, providing detailed hazard information critical for workplace safety.
Step-by-step explanation:
The marking system that complies with the OSHA Hazard Communication Standard is the Material Safety Data Sheet (MSDS), now referred to as Safety Data Sheets (SDSs).
Other systems like the DOT placard, NFPA 704, and the Hazardous Materials Information System provide important safety information, but in the context of OSHA's regulations for workplace hazard communication specifically, it is the SDS which is central. SDSs provide detailed information regarding the chemicals, their hazards, and the necessary precautions for safe handling and use in a workplace, and employers must ensure SDSs are readily accessible to all workers.