G-suite Forms Quiz. Random answers

I'm looking at a script to make forms from a spreadsheet, I found some application that already does, but I wanted to make some modification.

https://scooltic.es/generador-de-examenes-aleatorios-con-google-forms/

I wish I could get multiple answers out randomly.

I have found that with:

• setIsQuiz(true) converts a form into a questionnaire.

• setShuffleQuestions(true) questions in a form are randomized.

• setRequired(true) is obligated to answer the question.

But I don't see how to make the answers of MultipleChoiceItem random, for example.

I think it should be here:

https://developers.google.com/apps-script/reference/forms/multiple-choice-item

But I can't find the solution, does anyone know?

Thanks