The correct answer is (d). Bluetooth technology allows wireless communication between equipments. It is a short-range wireless technology that allows two devices to communicate with each other over a distance of up to 30 feet. Bluetooth is used in a variety of devices, including mobile phones, laptops, and printers. It is a convenient way to connect devices without the need for cables.
(a) is incorrect because Bluetooth technology can be used on a variety of devices, not just mobile phones.
(b) is incorrect because Bluetooth technology is not used for landline phone to mobile phone communication.
(c) is incorrect because Bluetooth technology is not used for satellite television communication.