Which function is used to delay execution for a number of milliseconds?

• A. delay()
• B. pause()
• C. wait()
• D. sleep()

Answer: (A)

When you need to pause program execution for a precise amount of time measured in milliseconds, you want a function that takes the number of milliseconds as its input and blocks for that duration. delay() is designed for this exact purpose, with its argument representing the millisecond delay you want. It’s the straightforward, explicit way to create a fixed, millisecond-scale pause in many embedded and timing-focused environments.

Other options don’t fit as neatly. pause() isn’t standardized for a fixed millisecond delay and may imply a more general or different kind of halt. wait() is often associated with waiting for a condition or event rather than enforcing a precise time span, and its timing semantics can be unclear. sleep() is commonly defined to pause for a number of seconds (or fractional seconds in some contexts), which makes it less precise for millisecond timing and can lead to confusion about the unit of time. Because delay() clearly expresses and enforces a millisecond delay, it’s the best choice.