A security researcher documents a new attack where an adversary positioned near a commuter train station uses a Bluetooth LE scanner to identify commuters' devices by their Bluetooth device names and MAC addresses, then correlates this data with their daily commute patterns. Which feature, available on Android 6+ and iOS 14+, was specifically designed to mitigate this type of passive Bluetooth tracking?

• A.B. Bluetooth LE MAC address randomization for scanning and advertising, which rotates the address used so observers cannot correlate advertisements to the same device over time
• B.A. Bluetooth pairing encryption using LE Secure Connections
• C.C. Wi-Fi MAC randomization, which also applies to Bluetooth interfaces on dual-mode chipsets
• D.D. Bluetooth device name obfuscation that replaces the hostname with a randomly generated identifier