Final answer:
Biosafety levels classify pathogens based on risk, but the notation 'Classa)' with lettered options does not correspond to the numeric BSL designations used by health agencies. Infectious material is a controlled product of Class D.
Step-by-step explanation:
The question appears to be in reference to the classification of infectious material, which is related to the biosafety levels established by agencies like the CDC (Centers for Disease Control and Prevention) for handling pathogens in a laboratory setting. Infectious material is likely to be referring to a controlled product associated with a specific class of biological safety. These biosafety levels classify pathogens based on their risk to laboratory personnel and the environment. Infectious material is a controlled product of Class D.
Without specific context identifying the meaning of 'Classa)', it is not possible to correctly answer this question. However, the CDC's biosafety levels range from BSL-1 to BSL-4, with BSL-1 being the least severe and BSL-4 the most severe in terms of containment measures and pathogen risk.