Which is the command to move the cursor to the beginning of line in mysql input editor?

Answer: Option D

This question asks about how to move the cursor in the MySQL editor. Imagine you are typing a command and you want to go back to the start of the line to make a change. Think of the cursor as a blinking line that shows where you are typing.

The correct answer is Option D: Ctrl-A.

Here's why:
* Ctrl-A is a common keyboard shortcut across many programs that means "select all" or "go to the beginning of the line".

Let's look at why the other options are incorrect:
* Ctrl-E is often used to move the cursor to the end of the line.
* Ctrl-D is usually used to delete the character to the right of the cursor.
* Esc-a is not a standard keyboard shortcut in the MySQL editor.

So, if you need to quickly move to the start of a line in the MySQL editor, remember to use Ctrl-A!