019
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DC1 ( XON) ( Device Control 1)
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DC3 ( XOFF)( Device Control 3)
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DC2 ( Device Control 2)
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DC4 ( Device Control 2)
Reveal answer
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B
Correct answer
Explanation
ASCII code 19 (DC3) is the XOFF character, which stands for 'transmit off.' It is used in flow control to signal a device to stop sending data. The opposite is DC1 (17), which is XON for 'transmit on' to resume transmission.
AI explanation
In the ASCII table, decimal code 19 corresponds to the control character DC3 (Device Control 3), which is conventionally used as the XOFF signal in software flow control (pausing transmission), paired with DC1/XON (code 17) to resume it. DC1 is 17, DC2 is 18, and DC4 is 20 — so of the choices, only DC3 matches code 19.