The following statements are not true about navigational attributes.
a. An attribute of an info object cannot be made navigational if the attribute-only flag on the attribute info object has been checked.
b. Navigational attributes can be used to create aggregates.
c. It is possible to make a display attribute to navigational in an info cube data without deleting all the data from the info cube.
d. Once an attribute is made navigational in an info cube, it is possible to change it back to a display attribute if the data has been deleted from the info cube.