A _______ port transmits one bit of a byte at a time as a single stream of bits. It is meant for transmitting slow data over long distances.

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**Solution:**

1. A **serial port** transmits data one bit at a time over a single wire, making it suitable for slow data transmission over long distances.

2. A **parallel port** transmits multiple bits simultaneously over multiple wires, which is faster but effective only for short distances.

3. A **Universal Serial Bus (USB)** is a modern type of serial bus but more complex than a simple serial port.

4. A **display port** is used for video connections, not for serial data transmission.

Therefore, the correct answer is **Serial**.

**Answer:** Serial

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