How to Hide the "301 Redirects" Admin Menu

function plt_hide_simple_301_redirects_menus() {
	//Hide the "Settings → 301 Redirects" menu.
	remove_submenu_page('options-general.php', '301options');
}

add_action('admin_menu', 'plt_hide_simple_301_redirects_menus', 11);

Where do I put this code?