I do have a doubt for example :6 from chapter:9,page:483 Why <c ut value="x" /> is the right answer? Because in the question they have written "which are valid examples of custom tag usage"? As per I know <c ut> is not a custom tag. It is from the JSTL. Can anyone please explain?
It is a library of custom tags, which has become a standard. But they are made just like custom tags. With a TLD, with classes. Look at the API. Tags from the JSTL are custom tags like any tags you will make yourself.