Which of the following is NOT a valid type of statement that can be included in a SAS program?

In SAS programming, there are specific types of statements that dictate how data is processed and managed within a program. The data step is critical for creating, manipulating, and transforming datasets. Similarly, a PROC step is essential for analyzing data, producing reports, and utilizing SAS procedures, like those for statistical analysis.

Global statements are also valid in a SAS program, serving to define global options or settings that apply to subsequent data or PROC steps throughout the session, such as the OPTIONS statement.

The term "Formula step," however, is not recognized as a valid statement type within SAS. While SAS does allow for the creation of formulas in various contexts (such as in DATA steps or PROC steps for calculations), there isn’t a standalone statement classified as a "Formula step." This distinction makes it clear that "Formula step" does not align with the established terminology and functionality within SAS, confirming it as the correct choice.