Which statement correctly describes serial and parallel ports?

Which statement correctly describes serial and parallel ports?

• A. A serial port transmits data one bit at a time, while a parallel port transmits 8 bits at a time.
• B. A serial port transmits 8 bits at a time, while a parallel port transmits one bit at a time.
• C. Both transmit the same number of bits at once.
• D. Serial ports require adapters to work.

Answer: (A)

Serial transmission sends bits one after another over a single line, while parallel transmission sends multiple bits at the same time over several lines. That’s why describing a serial port as transmitting one bit at a time and a parallel port as transmitting eight bits at once is the correct distinction. The idea here is about how wide the data path is and how many bits move simultaneously. The other statements either mix up the data width or imply a requirement (like adapters) that isn’t the defining difference between serial and parallel.

Serial transmission sends bits one after another over a single line, while parallel transmission sends multiple bits at the same time over several lines. That’s why describing a serial port as transmitting one bit at a time and a parallel port as transmitting eight bits at once is the correct distinction. The idea here is about how wide the data path is and how many bits move simultaneously. The other statements either mix up the data width or imply a requirement (like adapters) that isn’t the defining difference between serial and parallel.