Bluetooth and Wi-Fi are both wireless technologies but they serve different purposes and have different characteristics. Bluetooth uses a 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band, so statement (a) is correct.

Statement (b) is incorrect because Bluetooth is primarily used for connecting devices and creating a personal area network (PAN), not for Wireless Local Area Networks (WLAN). Wi-Fi, on the other hand, is used for WLAN and for internet access, not for Wireless Wide Area Networks (WWAN).

Statement (c) is also incorrect. Both Bluetooth and Wi-Fi technologies do not require the devices to be in the line of sight of each other.