Which of the following is true regarding the marking of tanks and containers for hazardous materials?

Marking tanks and containers for hazardous materials is governed by strict regulations to ensure safety and proper handling. The requirement to include "FLAMMABLE—KEEP FIRE AND FLAME AWAY" on the labeling is specifically aimed at alerting personnel and the public to the potential hazards associated with the contents. This clear warning serves as an immediate indicator of the risks involved and is crucial for safe management practices in environments where flammable substances are present. Proper labeling is a vital component of hazard communication and is essential to prevent accidents, ensure safe storage, and facilitate informed responses in emergencies.

The other options do not adequately communicate the necessary safety information. For instance, a general label may not provide specific enough information about the hazards that could be associated with the material. Including the chemical composition, while informative, does not directly address immediate safety concerns in the same straightforward manner as hazard warnings. Lastly, allowing tanks or containers to be unmarked if secured ignores the essential requirement for visible and clear hazard communication, which is critical for safe operations.