WP_Query meta_query relationの合せ技

$query = array(
	'posy_type'	=>	'test',
	// A=1 AND B=2 AND ( C=3 OR D=4 )
	'meta_query'	=>	array(
			'relation'	=>	'AND',
			array(
				'key'	=>	'A',
				'value'	=>	'1'
			),
			array(
				'key'	=>	'B',
				'value'	=>	'2'
			),
			array(
				'relation'	=>	'OR',
				array(
					'key'	=>	'C',
					'value'	=>	'3'
				),
				array(
					'key'	=>	'D',
					'value'	=>	'4'
				)
			)
			)
	);
$query_result = new WP_Query($query);
wp_reset_postdata();