Which statement correctly describes the behavior of the `$_REQUEST` superglobal?

Explanation

The $_REQUEST superglobal is an associative array that by default contains the contents of $_GET, $_POST, and $_COOKIE. Its contents depend on the 'request_order' directive in php.ini, but it is defined as the union of these three input sources.

Key points

$_REQUEST aggregates input from multiple sources
Includes GET, POST, and COOKIE data
Behavior is influenced by php.ini settings

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