Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make a dirty martini [title] Add ice to your cocktail shaker. [step] The shaker should be filled about half to three-quarters full, which will briefly chill the drink as it's mixed. [title] Freeze your martini glasses to keep the drink chilled.

Ending1: [step] Before you proceed to make your dirty martini, you should ensure that all of the martini glasses are thoroughly chilled before you top them with ice. [substeps] To avoid breaking the glass and spilling the drink, you may want to hold your cocktail shaker in a safe place. Ending2: [step] If you don't have time to freeze the glasses, simply fill them up with ice water for a few minutes while you prepare everything else. Then dump the chilled water just before pouring the drink out. Ending3: [step] Cold martini glasses are the smoothest when preparing a dirty martini. In general, you're less likely to damage or tarnish them by freezing your martini glasses before pouring it into your glass. Ending4: [step] If you have frozen martini glasses in your freezer, doing this will help to keep the drink cold and refreshing. The ice will also prevent the shaker from getting cold.

Answer format: ending1/ending2/ending3/ending4