Question: In a USIM Application Toolkit (USAT), what is the specific coding standard referenced for the Mobile Country Code (MCC) and Mobile Network Code (MNC) within the PLMN ID TLV object?
Option 1: Characteristics of the Universal Subscriber Identity Module (USIM) application
Option 2: Mobile radio interface signalling layer 3; General aspects
Option 3: Numbering, addressing and identification
Option 4: Mobile radio interface Layer 3 specification; Core network protocols; Stage 3
Explanation: The correct answer is Option 4 because the PLMN ID TLV object's MCC and MNC are specifically coded according to a standard dealing with Mobile radio interface Layer 3 specification for Core network protocols, which is directly referenced in the context of coding for MCC and MNC within the PLMN identity.