Multiple choice general knowledge science & technology 019 DC1 ( XON) ( Device Control 1) DC3 ( XOFF)( Device Control 3) DC2 ( Device Control 2) DC4 ( Device Control 2) Reveal answer Fill a bubble to check yourself B Correct answer Explanation In ASCII control codes, DC3 (Device Control 3) is commonly used as the XOFF signal to pause transmission in software flow control, while DC1 (XON) resumes it. DC2 and DC4 are generic device controls without standard flow control assignments.