Question: Under what condition does a gNB **not** perform the default channel access procedures as described in the downlink channel access procedures for shared spectrum channel access?
Option 1: When operating on a licensed assisted access (LAA) Primary Cell (PCell)
Option 2: When the higher layer parameter `channelAccessMode-r16` is provided and set to `'dynamic'
Option 3: When the higher layer parameter `channelAccessMode-r16` is provided and set to `'semiStatic'
Option 4: When sensing adjustments are not applicable
Explanation: A gNB performs channel access procedures unless the higher layer parameter `channelAccessMode-r16` is provided and set to `'semiStatic'`. In this scenario, the default procedure does not apply, indicating an exception based on the configuration of the `channelAccessMode-r16` parameter.