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 8+, was specifically designed to mitigate this type of passive Bluetooth tracking?

• A.LE Secure Connections pairing, which always encrypts the link and authenticates both endpoints because the exchange runs elliptic-curve Diffie-Hellman, removing the identifiers a scanner would correlate
• B.Wi-Fi MAC randomization, which the platform extends to the Bluetooth interface on every dual-mode chipset because the two radios share one address register, and a rotating value defeats the correlation the researcher describes
• C.Bluetooth device name obfuscation, which replaces the hostname with a random label because the name is the only field a passive scanner reads, and the label rotates hourly
• D.