Shuffle MC placement

I have a quiz with 4 answer options. (think ‘who wants to be a millionaire’).

Basically, I’m trying to get these answer options to change position each time the movie loads.

So, I have 4 mcs and 4 set positions - and I want the mcs to fill the positions at random.

I’ve played around with placing the mcs in an array but I get duplicates that way. Any ideas? Thanks.