Which one of the following statements is NOT true?

Activities involving infectious agents and rDNA are assigned to a
      specific biosafety level based on the potential hazards presented.
Individuals who may come in contact with human blood or
      potentially infectious material are required to participate in
      Bloodborne Pathogens Training.
All doors of biosafety level 2 and 3 laboratories must be posted
      with appropriate international biological warning symbols and other
      key information.
Biohazardous waste must be disposed of according to procedures
      specified in the Biological and Chemical Safety Plan.
All of the above are true.