Which one of the following operations does not automatically create expressions?

When a part is opened, no expressions are automatically created because this operation is essentially about accessing an existing model and its data, without modifying or defining new parameters. Opening a part simply loads it into the software environment without influencing how dimensions, features, or sketches are managed.

In contrast, dimensionally constraining a sketch actively involves defining sizes and relationships, which leads to the creation of expressions to represent those constraints. Similarly, creating a feature generally results in new expressions to define its parameters (like height, width, or other dimensions), while positioning a feature typically involves defining its location in relation to other parts or features, which again results in the need for expressions to express those relationships. Consequently, the act of merely opening a part does not engage in any of these expression-creating activities.