function llms_update_3160_update_attempt_question_data() {

	if ( 'complete' !== get_transient( 'llms_update_3160_update_question_data' ) ) {
		return true;
	}

	$skip = get_transient( 'llms_update_3160_skipper' );
	if ( ! $skip ) {
		$skip = 0;
	}
	set_transient( 'llms_update_3160_skipper', $skip + 500, DAY_IN_SECONDS );

	global $wpdb;
	$res = $wpdb->get_col( $wpdb->prepare( "SELECT id FROM {$wpdb->prefix}lifterlms_quiz_attempts ORDER BY id ASC LIMIT %d, 500", $skip ) ); // db call ok; no-cache ok.

	// Finished.
	if ( ! $res ) {
		set_transient( 'llms_update_3160_update_attempt_question_data', 'complete', DAY_IN_SECONDS );
		return false;
	}

	foreach ( $res as $att_id ) {

		$attempt   = new LLMS_Quiz_Attempt( $att_id );
		$questions = $attempt->get_questions();
		foreach ( $questions as &$question ) {

			$question['earned'] = empty( $question['correct'] ) ? 0 : $question['points'];
			if ( ! isset( $question['answer'] ) ) {
				$question['answer'] = array();
			} elseif ( ! is_array( $question['answer'] ) && is_numeric( $question['answer'] ) ) {
				$obj = llms_get_post( $question['id'] );
				if ( $obj ) {
					$choices = $obj->get_choices();
					if ( isset( $choices[ $question['answer'] ] ) ) {
						$question['answer'] = array( $choices[ $question['answer'] ]->get( 'id' ) );
					}
				}
			}
		}

		$attempt->set_questions( $questions, true );

	}

	return true;

}