Which method for transmitting data is specifically designed for distances up to 30 feet?

Wi-Fi technology is designed for much longer distances, typically ranging from 100 to 300 feet, depending on the environment and equipment used. It is primarily used for providing internet access to devices over larger areas, such as homes and offices, rather than the limited distances characteristic of Bluetooth.

Wide area networks (WANs) are intended for extensive geographic coverage, often spanning cities or countries. They utilize various transmission technologies to connect multiple local area networks (LANs) over great distances, making them unsuitable for the short-range, close-proximity communication that Bluetooth facilitates.

Near field communication (NFC) is designed for extremely short distances, usually requiring devices to be within a few centimeters of each other to establish a connection. While it is effective for tasks like mobile payments, its range is significantly shorter than Bluetooth, making it unsuitable for distances up to 30 feet.