Question: In GERAN Iu mode, when a LOCATION RELATED DATA REQUEST message is received by the BSS with a request for E-OTD positioning method, which of the following Information Elements (IEs) must be included in the message?
Option 1: Location Related Data Request Type IE and Location Related Data Request Type Specific To GERAN Iu Mode IE
Option 2: Only Location Related Data Request Type IE
Option 3: Only Location Related Data Request Type Specific To GERAN Iu Mode IE
Option 4: Neither Location Related Data Request Type IE nor Location Related Data Request Type Specific To GERAN Iu Mode IE
Explanation: According to specifications, for E-OTD positioning in GERAN Iu mode, the message must include the Location Related Data Request Type Specific To GERAN Iu Mode IE exclusively. This ensures the BSS can correctly initiate E-OTD positioning, as it's a GERAN Iu mode-specific method requiring this particular IE.