Question: If prompted for text at the standard input, you can tell the command you're done entering text with what key combination?

1. Ctrl + A (Windows) or Command + A (Mac)
2. Ctrl + E (Windows) or Command + E (Mac)
3. Ctrl + D (Windows) or Command + D (Mac)
4. Ctrl + Z (Windows) or Command + Z (Mac)

Answer: The correct answer of the above question is Option C:Ctrl + D (Windows) or Command + D (Mac)