Question: In a scenario where a Critical Communication Network (CPN) loses connectivity with the 5G core network, what spectrum type is used for Proximity-based Services (ProSe) / Direct Communications in Public Safety contexts?
Option 1: Licensed Spectrum
Option 2: Unlicensed Spectrum
Option 3: Both Licensed and Unlicensed Spectrum depending on operator configuration
Option 4: Spectrum allocated by the National Regulatory Authority
Explanation: According to the service requirements for the 5G system, in Public Safety contexts, licensed spectrum may be utilized for direct communications when there is no connectivity with the 5G core network. This contrasts with non-Public Safety scenarios where unlicensed spectrum would be used, highlighting the specialized treatment of Public Safety communications due to their critical nature.