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What is the difference between Bluetooth and Wi-Fi devices?

A)  Bluetooth uses 2.4 GHz radio frequency band whereas Wi-Fi can use 2, 4 GHz or 5 GHz frequency band

B)  Bluetooth is used for Wireless Local Area Networks (WLAN) only, whereas Wi-Fi is used for Wireless Wide Area Networks (WWAN) only

C)  When information is transmitted between two devices using Bluetooth technology the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight of each other

D)  The statements [a] and [b] given above are correct in this context