The correct answer is (a) Wireless.
Wireless communication is a method of exchanging data without the use of wires or cables. It relies on radio-signal or infrared signals to transmit data. Wireless communication is used in a variety of applications, including cell phones, televisions, and computers.
Wired communication is a method of exchanging data using wires or cables. It is the oldest and most common type of communication. Wired communication is used in a variety of applications, including telephones, computers, and televisions.
Fiber optics is a method of transmitting data using light. It is a newer type of communication that is becoming increasingly popular. Fiber optics is used in a variety of applications, including telecommunications, medical imaging, and industrial inspection.
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