How many data categorization impact levels does the Department of Defense define and provide authorizations for?
The DoD offers authorizations for IL-2, IL-4, IL-5, and IL-6.
### Instruction: How many data categorization impact levels does the Department of Defense define and provide authorizations for?
### Context: 
### Answer: The DoD offers authorizations for IL-2, IL-4, IL-5, and IL-6.</s>