Your program does not calculate the average correctly. How might you have known that an error existed?

Select 4 options.

1. user feedback

2. print debugging

3. A user complained about the language used in the program.

4. test cases

5. automated testing

3

Explanation:

I think 3 is really the answer

Css3 is the latest evolution of the cascading style sheets language and aims at extending css2.1. it brings a lot of new features and additions, like rounded corners, shadows, gradients, transitions or animations, as well as new layouts like multi-columns, flexible box or grid layouts.credits to medium for making this answer credits to google for copying this answercredits to me for putting this answer on your question

You probably find kind your i think