question: What aspect does the CT Work Item "V8-CT" focus on? [3GPP Release 14] option 1: Emergency call in Local breakout roaming architecture option 2: Location determination at IMS entities in the HPLMN option 3: Local number translation in VPLMN for legacy CS and Local Breakout option 4: Fetching and providing necessary information for emergency call option 5: Charging principles for S8HR roaming architecture 