At present,scientists can determine the arrangement or relative positions of genes or DNA sequence on a chromosome. How does this Knowledge benefit us ?1. It is possible to know the pedigree of livestock.2. It is possible to understand the causes of all human diseases.3. It is possible to develop disease resistant animal breeds.Which of the statements given above is/are correct ?

• A. 1 and 2 only
• B. 2 only
• C. 1 and 3 only
• D. 1,2 and 3