In MySQL, the SHOW CHARACTER SETS statement is used to list all available character sets. It will display information about the character sets supported by the MySQL server, including their names and descriptions.

For example:

SHOW CHARACTER SETS;

This will return a list of character sets such as utf8, latin1, utf8mb4, and others available in the MySQL server.

Why the other options are incorrect:

• (B) SHOW COLLATIONS: This command lists the available collations in MySQL, not character sets.
• (C) SHOW CHARACTER SET: This is incorrect because there is no SHOW CHARACTER SET command in MySQL. The correct command is SHOW CHARACTER SETS.
• (D) SHOW COLLATION: Similar to (B), this command lists available collations, not character sets.

Thus, the correct command to find out which character sets are available is (A) SHOW CHARACTER SETS.