Which of these is an element of both paraphrasing and summarizing?

1. giving a broad overview of central ideas

2. shortening the length of the original text

3. restating all of a text's ideas and details

4. putting ideas from a text in one's own words

Seems to me that the second option looks as if it were correct. While paraphrasing and summarizing, you are trying to shorten up an original piece of writing. Giving a well developed descriptions of main ideas isn't something to look for in paraphrasing, so that's why the first option is incorrect. In addition, restating basically everything from a text is not called paraphrasing nor summarizing, and that is why I'd rather classify it as copying.