Which statements about workflow constants are true?

Workflow constants in Alteryx are special values that you can set in your workflow to maintain specific, unchanging data throughout your process. The statement about the default data type for workflow constants being string is true. This means when you create a workflow constant, it will automatically be treated as a string data type unless specified otherwise.

Having a default data type of string allows for easy integration across various tools within a workflow where textual data is frequently utilized, such as in formulas and expressions. This foundational aspect of workflow constants facilitates consistent data handling and usage, particularly when textual representation is needed.

In contrast, the other statements do not hold true: workflow constants can be used across multiple workflows, they do not need to be activated to appear in the expression editor, and while it's advisable for workflow constants to have meaningful variable names, unique names are not strictly enforced by the software.