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What are the four cheeses generally used in"four-cheese" pizzas?

2 Question has nothing to do with ovens or microwaves
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What are the four cheeses?

In common consumer pizza, microwave and bake-at-home pizzas are often advertised as four-cheese pizzas. What are these four cheeses, traditionally? Do different brands use different mixes, or does everyone stay about the same? How are these cheeses traditionally mixed, in what fashion?