Example for how to use the gquiz_answer_indicator filter

gfroms-examples.php

//advanced - more control
add_filter( 'gquiz_answer_indicator', 'gquiz_answer_indicator', 10, 7);
function gquiz_answer_indicator ($indicator_markup, $form, $field, $choice, $lead, $is_response_correct, $is_response_wrong){
	if ( $is_response_correct )
		$indicator_markup = ' (you got this one right!)';
	elseif ( $is_response_wrong ) {
		if  ( $field['inputType'] == 'checkbox' && rgar( $choice, 'gquizIsCorrect' ) )
			$indicator_markup = ' (you missed this one!)';
		else
			$indicator_markup = ' (you got this one wrong!)';
	} elseif ( rgar( $choice, 'gquizIsCorrect' ) ){
		$indicator_markup = ' (this was the correct answer!)';
	}
	return $indicator_markup;
}

This seems to be not working, because the indicator image is actually hardcoded in plugin JS.