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

Wide area networks are designed to cover large geographical areas, often spanning cities or even countries. WANs facilitate communication over much greater distances than 30 feet, utilizing various transmission technologies such as leased lines or satellite links, making them unsuitable for short-range applications.

Wi-Fi provides wireless networking capabilities over a range that typically exceeds 30 feet, often reaching up to several hundred feet in open areas. While Wi-Fi can be used for local connections, its design is not limited to short distances, which sets it apart from Bluetooth.

Near field communication is a technology that operates over extremely short distances, typically just a few centimeters. While NFC is effective for contactless transactions and data exchange, its operational range is significantly shorter than Bluetooth, which is designed for distances up to 30 feet.