单项选择题
A customer, Bob, needs to be able to access the Internet while traveling. Which of the following could Jill, a technician, recommend to Bob?（）
A. Cellular service with an adapter for Bob’s laptop.
B. USB adapter with 802.11n capabilities for maximum speeds.
C. A Bluetooth card to attach to multiple networks.
D. Enable Wi-Fi so Bob can connect to any open network.
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