Question: In UTRAN Iur interface RNSAP signalling, when a receiving node encounters a Protocol Error, which of the following error classes is related to a mistake in the encoding or formatting of the message itself?
Option 1: Logical Error - Incorrect application of protocol procedures
Option 2: Transfer Syntax Error - Error in message encoding or formatting
Option 3: Abstract Syntax Error - Inconsistency with the defined protocol structure
Option 4: None of the Above - Protocol Errors are not categorized in this manner
Explanation: Transfer Syntax Error refers to issues with how the data is encoded or formatted within a message, which aligns with mistakes at the encoding or formatting level. This distinction is crucial for accurate error reporting and debugging in RNSAP signalling, as it helps pinpoint the root cause of the protocol error.