It is a function that ends the connection to the database.
select one:
a. mysql_close / mysqli_close
b. mysql_query / mysqli_query
c. mysql_connect / mysqli_connect
d. mysql_error / mysqli_error

a. mysql_close / mysqli_close

Explanation:

mysql_close/mysqli_close closes existing MySql connection.

Example usage:

<?php

$link = mysql_connect('localhost', 'userid', 'password');

// Close the connection reference $link

mysql_close($link);

?>

Mysqli represents an improved version of mysql driver.

<?php

$link = mysqli_connect('localhost', 'userid', 'password');

if ($link) {

   // Close the connection reference $link

   mysqli_close($link);

}

?>

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explanation:

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