Question: What is the primary purpose of using a Lawful Interception Identifier (LIID) with indirect identification in the context of lawful interception in telecommunications?
Option 1: To directly expose target identities to all handling agents for ease of access.
Option 2: To facilitate the correlation of intercepted data across different networks (e.g., between GSN and IMS).
Option 3: To serve as a universal identifier for all targets across different Law Enforcement Agencies (LEAs).
Option 4: To limit knowledge about a specific target within authorized operators and LEA handling agents, enhancing confidentiality.
Explanation: The correct answer, Option 4, highlights the key benefit of using indirect identification via LIID - to restrict sensitive information about the target to only those who need to know, thus maintaining confidentiality. This aligns with the text's emphasis on limiting knowledge about a specific target within authorized parties. Options 1, 2, and 3 either misrepresent the purpose (Option 1), focus on a secondary aspect (Option 2), or introduce an incorrect universality (Option 3).