Question: What does a `Granted-Validity-Time` value in the past indicate for a NIDD Authorization in the context of HSS (Home Subscriber Server) and SCEF (Service Capability Exposure Function) interaction?
Option 1: The NIDD Authorization is pending approval.
Option 2: The NIDD Authorization has been updated with new privileges.
Option 3: The NIDD Authorization is explicitly revoked.
Option 4: The NIDD Authorization validity period has been extended.
Explanation: When the `Granted-Validity-Time` contains a value in the past, it signifies that the NIDD Authorization is no longer valid and has been explicitly revoked, implying both HSS and SCEF treat the authorization as terminated.