Which statement is true regarding the decision service rule project hierarchy?

A standard rule project can be changed to a main rule project when it is reference by other rule projects.

Changing a rule project to a main rule project can affect the deployment and synchronization of the project.

Changing a main rule project to a standard rule project removes the main rule project references to other rule projects.

Changing a rule project from a standard rule project to a main rule project always requires changes to the way rule projects are referenced.