Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to make cookies and cream rice krispie treats [title] Melt the butter in a large saucepan. [step] Over a low heat setting, melt the butter to where it is nearly all liquid. [title] Add the marshmallows.

Ending1: [step] Before the butter melts completely, stir it occasionally with a wooden spoon. ( the butter needs to melt evenly before you can add it. Ending2: [step] When the butter has melted, add the marshmallows. [title] Sauté on low for 20 minutes or until the marshmallows have dissolved. Ending3: [step] Combine and stir the butter and marshmallows until everything is melted thoroughly. [title] Remove the pan from the heat and add the 10 oreos that were chopped. Ending4: [step] Pour the melted butter into the saucepan with the marshmallows. Stir the mixture in until the marshmallows are completely melted.

Answer format: ending1/ending2/ending3/ending4