How to Hide the "reCAPTCHA options" Admin Menu

function plt_hide_login_form_recaptcha_menus() {
	//Hide the "Settings → reCAPTCHA options" menu.
	remove_submenu_page('options-general.php', 'recaptcha-options');
}

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

Where do I put this code?