How can we define the clause "FROM" in Mysql?

Answer: Option C

The "FROM" clause in MySQL tells the database which tables you want to work with. It's like saying, "I want to look at these specific tables."

Here's a breakdown of the options:
Option A: It defines the tables used by a query - This is correct. The "FROM" clause tells MySQL which tables to use for the query.
Option B: It defines the linking of tables in MySQL - This is partially correct. The "FROM" clause can be used to link tables, but it doesn't define the entire linking process.
Option C: It defines the tables used by a query & linking of tables in MySQL - This is partially correct. The "FROM" clause defines the tables but not the entire linking process.
Option D: None of the mentioned - This is incorrect.
The "FROM" clause is essential for retrieving information from tables.
So the best answer is Option A.