Validvarname=ANY can contain numerics?

[jaliu]

This is a very good explanation, but the book does not say this. Maybe you should write one. 

I'm realizing that the prep book is not a good tool.

[Panagiotis]

By default, SAS has column naming rules. You can change that with the VALIDVARNAME= option. If you get a question wrong, it's best to do further research. For example, for the question you posted you have multiple options:

1. First is to reread about that option in the certification book. I'm not sure what version you have, but the the version I'm looking at explains what VALIDVARNAME= does. It's in Chapter 2 - Basic Concepts. It takes up an entire page. For the version i'm looking at start on page 12 "Rules for SAS Names".

2. You can also read the quick feedback they give you for a question at the end of the book. It quickly explains why something is correct. Here it explains that if you use the option ANY, the name can begin with  or contain any characters, including blanks, national characters, special characters, and multi-byte character. That's the feedback for the exact question you posted.

3. Lastly, go to the documentation for the full option. Here is the doc for the option: https://go.documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/engfedsrv/p1ffkpdm6kbjawn1wvfpgzuzjcbg.htm

- Peter