Which of the following cocktails is typically served straight up in a cocktail glass?

The Margarita is typically served straight up in a cocktail glass, which means it is strained into the glass without ice. This method emphasizes the drink's flavors and provides a smooth texture, which is particularly enjoyable in cocktails that showcase citrus and spirit combinations. The classic Margarita consists of tequila, lime juice, and orange liqueur, and it benefits from being served chilled and without ice to enhance its refreshing quality.

Conversely, the Old Fashioned is customarily served over ice in an Old Fashioned glass, allowing for dilution as the ice melts. The Whiskey Ginger is generally served on the rocks with ice in a tall glass to keep it refreshing and cool. Lastly, the Tom Collins, a mixed drink made with gin, lemon juice, sugar, and soda, is also served over ice in a tall glass to maintain its crisp and refreshing nature. This context highlights the unique serving style of the Margarita, aligning with its characteristics as a classic cocktail typically enjoyed straight up.