​When Analyzing the List of Nouns to Determine Whether to Exclude

Multiple Choice

​When analyzing the list of nouns to determine whether to exclude a particular noun as an important "thing,"  which of the following questions should be asked about the noun?

A) Is it in the domain?
B) ​Is it a synonym of an existing thing?
C) ​Is it a tangible item 
D) ​Is it identifiable?
E) Is it a persistent item?
F) Is it an output from the system?