Question: What is the primary purpose of the 'Information Exchange Failure' procedure initiated by a Radio Network Controller (RNC) in UTRAN's Iur interface?
Option 1: To notify another RNC that previously requested information exchange can no longer be reported due to failure.
Option 2: To establish a new signalling bearer connection for a Distant RNC Context.
Option 3: To request additional resources for ongoing information exchanges between RNCs.
Option 4: To confirm successful completion of an information exchange with another RNC.
Explanation: The 'Information Exchange Failure' procedure is used when an RNC needs to communicate the failure of a previously requested information exchange to another RNC, utilizing the established signalling connection for the relevant context. This handles error communication between Radio Network Controllers in UTRAN's Iur interface.