Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to make white chocolate rainbow brownies [title] Double boil the chocolate chips with the butter. [step] ( this means heat them until melted/blended in a pot/bowl on top of another pot with boiling water in it. This keeps them off of the direct heat source so they don't burn).

Ending1: [title] Sift the melted butter on a kitchen tile surface. [step] It should be about a cup or 2 thick. Ending2: [title] Put the base (top) of the brownie mix into the medium-sized pot. [step] Add a pinch of salt and spread about 3/4 of the mixture out. Ending3: [title] Melt the chocolate in a large saucepan or a large microwave-safe bowl. [step] ( the microwave, as the name implies, is only used to heat the chocolate down. Ending4: [title] Take them off the heat when completely melted. [step] Let cool to room temperature (even a little warmer is fine).

Answer format: ending1/ending2/ending3/ending4