Which of the following statements correctly expresses the need for indexing and abstracting?

1. The number of articles published in journals may amount to millions of items.

2. The volume of primary literature published especially in periodicals is diminishing at a fast speed and rate.

3. The scholars require some help in locating and having access to information from a huge stockpile of information sources.

4. Due to problems of scatter and seepage of information, the scholars are unaware of literature in a particular subject appearing in totally alien sources published in various countries.