Question: What is the primary purpose of the SS Version Indicator information element in the context of mobile radio interface layer 3 specifications?
Option 1: To encode the Facility information element for supplementary services.
Option 2: To decode the SS Version information field for core network protocols.
Option 3: To define the usage of the SS version information field for supplementary services specification.
Option 4: To aid in the decoding of the Facility information element as described in the supplementary services specification.
Explanation: The correct answer is Option 4 because the primary purpose of the SS Version Indicator information element is to aid in the decoding of the Facility information element, which is crucial for understanding and implementing supplementary services in mobile radio interface layer 3 specifications.