Audit Option
If an instructor permits a student to take a class on an “Audit” basis, the student is required to be officially enrolled in the class and submit a Credit/No Credit/Audit option form by last day to add of each semester (check Registration Calendar for exact date). Go to the Forms page, under Grade/ Grading title you will find a form for specific term.
See 菠菜网lol正规平台 Catalog - Auditing a Class - "AU"