Question: What is the primary purpose of transferring "Encryption parameters" from the BM-SC to the DF2 over the X2-interface, as considered in the context of lawful interception?
Option 1: To facilitate secure communication between the Law Enforcement Agency and the BM-SC.
Option 2: To enable the DF2 to encrypt intercepted Content of Communication (CC) for storage.
Option 3: To allow the DF2 to authenticate the target UE's identity more securely.
Option 4: To provide the DF2 with necessary keys and parameters for decrypting intercepted Content of Communication (CC).
Explanation: The correct answer is Option 4 because, in the context of lawful interception, transferring encryption parameters (keys and associated parameters) from the BM-SC to the DF2 is primarily intended to enable the DF2 to decrypt the intercepted Content of Communication (CC). This is crucial for making the intercepted content intelligible to law enforcement agencies. The other options either misinterpret the purpose of transferring encryption parameters or relate to different aspects of security and interception not directly relevant to the primary function of decryption in this context.