Question: What triggers a Resource Status Indication procedure in a Node B, according to UTRAN Iub interface NBAP signalling?
Option 1: Only changes in the operational state of dedicated transport channels.
Option 2: Addition or removal of a User Equipment (UE) from a cell.
Option 3: Changes in Local Cell capabilities, resource operational states, or setup/failure of secondary frequencies in multi-frequency cells.
Option 4: Modification of the Node B's overall transmission power.
Explanation: This option correctly encompasses several scenarios that trigger a Resource Status Indication procedure as outlined in the context, including changes in Local Cell capabilities (point 3), changes in resource operational states (implied across various points), and the specific case of secondary frequency failure in multi-frequency cells (point 8). This demonstrates a nuanced understanding of when the network would initiate a resource status update to ensure efficient management and allocation of resources within the Node B.