Final answer:
Sensitive compartmented information (SCI) should not be faxed without proper security measures in place. The correct answer is c) Only with encryption.
Step-by-step explanation:
According to government regulations, sensitive compartmented information (SCI) should not be faxed without proper security measures in place. Because of its highly sensitive and classified nature, SCI needs to be protected from unauthorized access and interception. Therefore, the correct answer to the question is c) Only with encryption. Encryption ensures that the information is secure and cannot be accessed by unauthorized individuals.