Question: In UTRAN Iur interface (RNSAP signalling), for FDD mode, if a RADIO LINK ACTIVATION COMMAND message includes a Delayed Activation Update IE indicating 'Activate' but excludes the First RLS Indicator IE, what action should the DRNC (Drift RNC) take?
Option 1: Proceed with link activation without further checks.
Option 2: Send a confirmation request to the SRNC (Serving RNC) for validation.
Option 3: Initiate the ERROR INDICATION procedure.
Option 4: Ignore the command and maintain current link settings.
Explanation: According to the specified condition, if a RADIO LINK ACTIVATION COMMAND message in FDD mode includes a Delayed Activation Update IE set to 'Activate' without including the First RLS Indicator IE, the DRNC is required to initiate an ERROR INDICATION procedure. This ensures error handling and maintains network integrity by responding appropriately to potentially inconsistent or incomplete commands.