Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make an oreo milkshake [title] Prepare the glasses. [step] Chill glasses in the freezer for about 15 minutes, or until slightly frosty. This will keep your milkshake from melting too quickly.

Ending1: [substeps] Chill your glass in the freezer overnight for best results. Be sure to use cold glasses for your milkshake because the cornstarch may be freezing. Ending2: [substeps] You can make one giant milkshake, or divide it among several smaller glasses. [title] Drizzle syrup into the glass (es). Ending3: On the day of the party, make sure to chill glasses for approximately 6 hours. Do not mix the milkshake with ice cream, shake or slosh any cornstarch into the glasses until fully blended. Ending4: On the other hand, if you push the ice cubes around too quickly, they may melt and mess around and make you lose your milkshake. [substeps] This step is optional so as to not freeze your milkshake.

Answer format: ending1/ending2/ending3/ending4