Which of the following examples illustrates the use of the 'Up' pour?

The choice that illustrates the use of the 'Up' pour correctly is Jim Beam straight up. In bartending terminology, an 'Up' pour refers to a drink that is served chilled but without any ice. This typically involves shaking or stirring the ingredients with ice to chill them and then straining the mixture into a glass without ice.

In the case of Jim Beam straight up, the bourbon is served without any ice, embodying the 'Up' concept as it is served in its pure form, allowing the drinker to experience the full flavor and character of the bourbon. The absence of ice means that the drink is not diluted, maintaining the intended taste profile.

In contrast, the other examples do not accurately represent the 'Up' pour. A Vodka Collins traditionally includes ice and is served in a tall glass; Rocks whiskey is served over ice; and Neat bourbon, while similar to 'up', typically implies no stirring or shaking, but it is commonly understood as being served without ice as well. However, the distinction of 'Up' more explicitly relates to the mixing method prior to serving, which in this case applies best to Jim Beam straight up.