Final answer:
It is true that using "ca" as the criterion is the same as using "ca" or "ca" in a text field, since including identical criteria with an 'or' condition does not change the filtering outcome.
Step-by-step explanation:
The statement that using "ca" as the criterion in a short text field is the same as using "ca" or "ca" as the criterion is True. When setting criteria in text fields, especially in the context of database queries, programming, or data filtering, specifying a single criterion such as "ca" is equivalent to stating it twice using an 'or' condition.
For example, if you are filtering a list of words and you want to select those that contain the text "ca", it is enough to specify "ca" once. Including it twice with an 'or' in between ("ca" or "ca") does not change the outcome because the 'or' condition is satisfied by any entry that meets either criterion, but since they are identical, it's a redundancy.