When assessing a hazardous spill scene, which observations would indicate that a hazardous spill could present an immediate danger to health & safety?
a. A volatile chemical spill of unknown duration in an enclosed area with poor ventilation.
b. Persons exhibiting or complaining of symptoms of exposure associated with the spilled substance.
c. A spill of a flammable liquid located near a potential ignition source.
d. All of the above