Question: What is the primary security concern related to the 'application/mbms-envelope+xml' media format in MBMS environments, and what measures are recommended to mitigate this risk?
Option 1: Data privacy breach due to unauthorized access; Recommends encryption of all transmitted data.
Option 2: Denial of Service (DoS) attack through envelope modification or spoofing; Recommends source authentication and integrity protection of files.
Option 3: Malware dissemination via embedded objects; Recommends antivirus scanning of all received envelopes.
Option 4: Network congestion from large file transfers; Recommends implementing Quality of Service (QoS) policies.
Explanation: The correct answer highlights the primary security concern as Denial of Service (DoS) attacks, facilitated by modifying or spoofing the envelope. Source authentication and integrity protection are recommended to prevent such attacks, ensuring the validity and trustworthiness of the files contained or referenced within the envelope.