According to GHS labeling guidelines, which two signal words are permissible?

The permissible signal words according to the Globally Harmonized System (GHS) labeling guidelines are "Danger" and "Warning." "Danger" indicates a more severe hazard, while "Warning" is used for less severe hazards. This differentiation helps users quickly assess the level of risk associated with a chemical or substance.

The other options do not adhere to the GHS standards. For instance, "Caution" and "Alert" are not recognized signal words within the GHS framework, and therefore, they do not fulfill the requirements set forth by the system. Similarly, "hazard" is not considered a signal word under GHS guidelines. Understanding these classifications is crucial for ensuring proper communication of hazards and safeguarding health and safety in environments where chemicals are handled.