Question: In an MBMS download service, what is the primary purpose of the "Decryption-KEY-URI" attribute within the "file" element of the FLUTE FDT instance?
Option 1: To specify the encryption algorithm for protected download files
Option 2: To indicate the association between a protected download file and its relevant decryption key file
Option 3: To provide authentication credentials for accessing MBMS services
Option 4: To define the quality of service (QoS) parameters for file downloads
Explanation: The "Decryption-KEY-URI" attribute is specifically designed to link a protected download file with its corresponding decryption key file. This association enables User Equipment (UE) to locate and download the necessary decryption key, facilitating the access to protected content. This process is crucial for secure content delivery in MBMS services, ensuring that only authorized users can decrypt and utilize the downloaded files.