First of all, n = intersection because the actual symbol would work for me

I need to simplify the set expression given above. I think the answer is (A U B) n C? Maybe even A n C?Code:(A U B U C U D) n (A U B U C) n (A U B) n C

Maybe the above is correct but I want to know how to show the stages of simplifying it. For example, by commutativity, associativity and idempotence.

Any help would be great, thanks.