What technology facilitates smartphone connectivity in the QX55?

The option highlighting Apple CarPlay and Android Auto compatibility is correct because these technologies are specifically designed to enhance smartphone connectivity in vehicles. They allow drivers to seamlessly integrate their smartphones with the car’s infotainment system, enabling access to apps, music, navigation, and communication features with ease. Users can control their devices through voice commands or the vehicle's touchscreen, which improves safety and convenience while driving.

The other choices, while they represent useful features, do not specifically focus on the primary aspect of smartphone connectivity. Bluetooth streaming audio enables audio playback from a phone but does not provide the comprehensive integration that CarPlay and Android Auto do. Navigational app integration allows for accessing navigation features but does not cover the full scope of smartphone interactions. Wireless charging pads enhance convenience but do not offer connectivity in the ways that CarPlay and Android Auto facilitate.