What do you mean by full-duplex mode ?

Asked in Computer Programmer Examination 2021 · Topic: Data Communication and Transmission Modes (Data Flow Directions (Simplex, Half-Duplex, Full-Duplex))

1. Sender can send message to receiver but re‐ ceiver can't send message to sender.
2. Sender can message to receiver and receiver can send message to sender, but not simultan‐ eously.
3. Sender can send message to receiver and re‐ ceiver can send message to sender simultan‐ eously.
4. Neither sender nor receiver can exchange information with each other.

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