Question: In a Bearer Independent CS Core Network, when an Intermediate Serving Node (SN) receives a backward message with LCLS Negotiation Response and LCLS Configuration Preference Information Elements, what action does it take regarding these elements?
Option 1: Modify the LCLS Negotiation Response based on its local configuration before forwarding.
Option 2: Discard the LCLS Configuration Preference Information Elements to reduce message size.
Option 3: Generate a new LCLS Negotiation Response if the received one indicates 'LCLS is not supported by a subsequent node'.
Option 4: Store the LCLS configuration settings and forward both elements unchanged.
Explanation: According to telecom principles for efficient network operation, Intermediate Serving Nodes facilitate seamless communication. When receiving backward messages with specific service negotiation responses (like LCLS) and configuration preferences, the node ensures continuity of service settings across the network by storing the configuration for local reference and forwarding these elements unchanged, maintaining end-to-end service integrity without unnecessary modifications or omissions.