Question: Where is the Home Network Private Key used for subscriber privacy protected from physical attacks?
Option 1: In the SIDF
Option 2: In the UE
Option 3: In the SEPP
Option 4: In the UDM
Explanation: The UDM is responsible for protecting the Home Network Private Key used for subscriber privacy from physical attacks, as it holds the private key and executes the algorithm for subscriber privacy in its secure environment.