Question: Which logical channel is used to transmit the SecurityModeComplete message from the User Equipment (UE) to the Evolved Universal Terrestrial Radio Access Network (E-UTRAN)?
Option 1: DTCH (Dedicated Traffic Channel)
Option 2: DCCH (Dedicated Control Channel)
Option 3: CCCH (Common Control Channel)
Option 4: BCCH (Broadcast Control Channel)
Explanation: The SecurityModeComplete message is a control plane message used for confirming the successful completion of a security mode command, which falls under the scope of dedicated control channel communications between the UE and E-UTRAN. DCCH is responsible for transmitting dedicated control information, making it the appropriate logical channel for this message.