Question: What is the primary purpose of the Radio Access Network Application Part (RANAP) protocol over the Iu interface in UTRAN?
Option 1: To manage the transmission of user data between the UE and the Core Network (CN)
Option 2: To provide a dedicated channel for Voice over IP (VoIP) services
Option 3: To handle mobility management tasks within the Core Network exclusively
Option 4: To facilitate general UTRAN procedures, transparently convey messages between CN and UE, and manage mobile-specific signalling
Explanation: RANAP is designed to handle a broad range of functions including facilitating UTRAN procedures initiated by the Core Network (e.g., paging), managing signalling for each User Equipment (UE) on a dedicated basis, transferring non-access signalling transparently, and more. This encompasses a wide scope of responsibilities beyond just user data transmission, VoIP services, or exclusive mobility management within the CN, making Option 4 the most comprehensive and correct answer.