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The correct answer is a. Bluetooth a type of wireless connection that can transfer data between your phone, PDA, and laptop.
The encoded data signal is transformed (modulated) into an auditory signal and transmitted by a transmitting modem. The audible signal is picked up by a modem attached at the other end of the communication link, which then demodulates it for the computer on the receiving end of the communication link. Wireless networks frequently employ directional and omnidirectional antennas. The highest transmission speed for Bluetooth v3 and v4 devices is 24 Mbps. A modem connects to a local service provider's cable or fiber. The signal from the modem is received by a wireless router that is linked to the modem. The wireless access point (AP), which is also the router, transmits via a wireless protocol.
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