Question: Under what condition(s) will Node B (NB) consider the Information Exchange Initiation procedure as failed when the Information Report Characteristics are set to 'On Modification'?
Option 1: When the Information Type is 'DGPS Corrections' or 'DGANSS Corrections' and the Information Threshold is not received, OR when the Information Type is not one of these corrections but the threshold is included.
Option 2: Only when the Information Type is neither 'DGPS Corrections' nor 'DGANSS Corrections' and the Information Threshold is missing.
Option 3: If the Information Type is 'DGPS Corrections' or 'DGANSS Corrections' with an incorrectly formatted Information Threshold, OR if the type is not one of these but no threshold is sent.
Option 4: When the Node B receives any Information Exchange Initiation Request without an Information Threshold for all Information Types.
Explanation: This option correctly identifies two scenarios where the procedure would fail: (1) 'DGPS Corrections' or 'DGANSS Corrections' on modification lacking a threshold, and (2) other information types set to report 'On Modification' yet still including a threshold, contradicting expected behavior. This requires nuanced understanding of conditional dependencies in telecom signaling protocols like NBAP.