How to enter "audit" on UC app?

<p>I am in the process of filling in all of my academic history. A couple of times I took a class for credit only and they have the option of choosing "CR" as your grade. But I don't see any option for audit. I audited 2 classes over the span of a few years. They are listed as "AU" on my transcript but there is no option for "AU" on the drop down menu. Should I enter "NC" which is no credit instead (basically the same thing) and then put a note where they let you add additional info? Or leave them out and mention that I audited 2 classes and when that was? Any advice?</p>

<p>Does anyone have an idea? I will see if I can call the Admission office.</p>