Question: In the context of Generic Bootstrapping Architecture (GBA), what format is used for encoding OSCORE (Object Security for Constrained RESTful Environments) messages, as related to GBA's Ua protocol?
Option 1: JSON (JavaScript Object Notation)
Option 2: XML (Extensible Markup Language)
Option 3: CBOR (Concise Binary Object Representation)
Option 4: ASN.1 (Abstract Syntax Notation One)
Explanation: In the context of GBA's Ua protocol, OSCORE messages are specifically encoded using CBOR, which is a compact binary format ideal for constrained environments, aligning with the efficiency goals of OSCORE and GBA in telecommunications. This choice reflects the standardized approach to efficiently encode security-related messages in resource-constrained scenarios typical of many IoT and mobile network applications.