Question: Under what condition, aside from having a valid Access Class with a corresponding zero bit in `ac-BarringForSpecialAC`, can a UE consider access to a cell as not barred when `SystemInformationBlockType2` includes 'AC barring parameter'?
Option 1: When the UE's `rand` number is higher than the value indicated by `ac-BarringFactor`.
Option 2: If the establishment of the RRC connection is due to a handover from another cell.
Option 3: When the RRC connection establishment results from a release with redirect and `mpsPriorityIndication`, and at least one bit for Access Classes 12, 13, or 14 in `ac-BarringForSpecialAC` is set to zero.
Option 4: If both timers T302 and 'Tbarring' are running simultaneously.
Explanation: This option correctly identifies an additional scenario where access is considered not barred. The condition specified in Option 3 aligns with the protocol's logic for handling RRC connection establishments resulting from a release with redirect and `mpsPriorityIndication`, particularly focusing on Access Classes 12, 13, or 14.