Question: In E-UTRA conformance testing for aerial scenarios requiring simulated GNSS signals, what does the term 'SV ID' represent for different Global Navigation Satellite Systems (GNSS)?
Option 1: Same identifier type across all systems (e.g., PRN for all)
Option 2: * GPS and Modernized GPS: Satellite PRN
  * Galileo: Code Number
  * GLONASS: Satellite Slot Number
  * BDS: Ranging Code Number
Option 3: A fixed, unique identifier assigned to each GNSS system as a whole
Option 4: The signal strength of the satellite in the test environment
Explanation: This is correct because, according to specifications for aerial testing in E-UTRA conformance testing, 'SV ID' (Satellite Vehicle ID) has different representations depending on the GNSS system being tested. This variability accommodates unique identification methods of each system, ensuring accurate and system-specific testing scenarios.