Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make easy sour cream chocolate frosting [title] Melt 2 cups (450 g) semisweet, milk or dark chocolate chips slowly in double boiler or in heat safe container in the microwave, stirring every 20 seconds. [step] Remove immediately from the burner or microwave once chocolate has melted and stirs smoothly. Do not over heat or you will scorch the chocolate and will not be able to use it.

Ending1: [title] Infuse the melted chocolate with milk or vegetable oils. [step] Stirring manually (about 2-3 minutes) or using your hands, mix the melted chocolate immediately while stirring. Ending2: If you grind the chocolate while melting it, you risk burning your mouth as well. Remove from the heat when it's fully melted. Ending3: [title] Stir sugar into a readiness packet, serve hot. [step] To make it easier, measure out the powdered sugar and add it a drop at a time. Ending4: [title] Make sure butter is at room temperature so it will disperse properly, add 8 tbsp. [step] ( 120 g) of butter to the melted chocolate and stir.

Answer format: ending1/ending2/ending3/ending4