In the Data Window, What Does It Mean When There

Multiple Choice

In the data window, what does it mean when there is a diagonal slash through the case number?

A) that case is missing data.
B) that case is not missing data.
C) that case is deleted from the dataset.
D) that case has been selected as part of a subset of the data.
E) that case has not been selected as part of a subset of the data.