The Time Dimension hierarchy is a good example of a__________.

B.
“There are two types of logical dimensions: dimensions with level-based hierarchies (structure hierarchies), and dimensions with parent-child hierarchies (value hierarchies). Level-based hierarchies are those in which members are of several types, and members of the same type occur only at a single level. In parent-child hierarchies, members all have the same type. Oracle Business Intelligence also supports a special type of level-based dimension, called a time dimension, that provides special functionality for modeling time series data.”
http://docs.oracle.com/cd/E15586_01/fusionapps.1111/e20836/dimensions.htm