Which of the Following Is True About Data Redundancy Within

Which of the following is true about data redundancy within one file?

A) The appearance of a particular data value multiple times in one field always indicates data redundancy.
B) Data redundancy cannot occur within a single file.
C) The problems caused by data redundancy within one file are substantially different from the problems caused by data redundancy across multiple files.
D) Data redundancy within one file occurs when different kinds of data (data about different entities) are merged in one file.
E) Data redundancy within one file only occurs when a single kind of data (data about a single entity) is present in the file.