Which clause is used to rename the existing table?

Answer: Option A

This question is about changing the name of a table in MySQL. Think of it like renaming a file on your computer.

We have several options:
Option A: RENAME - This is the correct answer! The RENAME clause is specifically designed to change the name of a table.
Option B: MODIFY - This clause is used to change the structure of a table, like adding or changing columns. It's not for renaming.
Option C: ALTER - This is a broad clause used for making changes to tables, including adding, deleting, or modifying columns. It's not the primary way to rename a table.
Option D: None of the mentioned - We already found the right answer, so this isn't correct.

In summary, the RENAME clause is the tool you need to change the name of your table in MySQL.