Elance Exams Answers PDF file

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When constructing a URL with query parameters (?test=1, for example), what is the correct expression to add the query parameters to the URL?

$url = $url . add_query_arg( 'test', '1' );
add_query_arg( 'test', '1', esc_url( 'http://domain.com/' ) );
add_query_arg( esc_url( 'http://domain.com/' ), 'test', '1' );
add_query_arg( esc_url( 'http://domain.com/' ), '1', 'test' );
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