Question: Which logical control channel is used to request a Dedicated Control Channel in the uplink direction?
Option 1: Paging CHannel (PCH)
Option 2: Random Access CHannel (RACH)
Option 3: Standalone Dedicated Control CHannel (SDCCH)
Option 4: Fast Associated Control CHannel (FACCH)
Explanation: The correct answer is Option 2, as the Random Access Channel (RACH) is used to request a Dedicated Control Channel in the uplink direction. This is specified in the text as "iv) Random Access CHannel (RACH): uplink only, used to request a Dedicated Control CHannel;".