What is used to garnish a Green Apple Martini?

A Green Apple Martini is typically garnished with a cherry or an apple slice. The use of a cherry adds a contrasting color and sweetness that complements the cocktail's flavor profile, while an apple slice reinforces the drink's apple base. This garnish enhances the drink's presentation, making it visually appealing to customers, which is an essential part of bartending.

The other choices, while they could serve as garnishes for different cocktails, don't align with the traditional presentation of a Green Apple Martini. A lemon twist is commonly used with citrus-forward drinks, a sugar rim can sweeten certain cocktails but isn’t specifically associated with the Green Apple Martini, and olives are typically featured in savory cocktails like martinis with gin or vodka. Hence, the use of a cherry or apple slice is the most appropriate choice for garnishing a Green Apple Martini.