CompTIA A+ 220-902

Answer: B - The most commonly used connection type when connecting a mobile phone directly to a PC is USB.

Key Takeaway:
USB is the most commonly used connection type when a user connects a mobile device directly to a PC. Although this can be accomplished through Bluetooth, the connection is a bit slow for any data. FireWire is not used for mobile devices, and while Wi-Fi is gaining in popularity (especially with iOS devices), it’s not the most effective way of connecting your mobile device for a complete sync yet.