As You Browse Through the Links That Could Be Useful

As you browse through the links that could be useful for your research, you will need to the websites you visit, by marking a site as a "Favorite" (Explorer) or adding it as a "Bookmark" (Firefox or Safari) , both of which are the electronic substitute for keeping a book on your desk.

A) keep track of
B) write down the URLs of
C) revisit frequently
D) All of these choices are correct.