Question: What is the primary purpose of including an indication of 'Manually Initiated eCall (MIeC)' or 'Automatically Initiated eCall (AIeC)' in the emergency call set-up by an In-Vehicle System (IVS) or other User Equipment (UE)?
Option 1: To enable the Public Land Mobile Network (PLMN) to prioritize and route eCalls to dedicated, eCall-equipped Public Safety Answering Points (PSAPs).
Option 2: To differentiate between voice and data transmissions within the eCall service.
Option 3: To inform the vehicle occupants about the initiation method of the eCall.
Option 4: To adjust the size of the Minimum Set of Data (MSD) transmitted.
Explanation: The indication of MIeC or AIeC is crucial for the serving network to differentiate eCalls from other emergency calls and to filter and route them appropriately to dedicated, eCall-equipped PSAPs. This ensures that eCalls are handled efficiently and effectively by the relevant authorities.