Q. Consider the following statements made about the sedimentary rocks:1. Sedimentary rocks are formed at earth's surface by the hydrological system.2. The formation of sedimentary rocks involves the weathering of pre-existing       rocks.3. Sedimentary rock contain fossils.4. Sedimentary rocks typically occur in layers.Which of these statements are correct? 

1. 1 and 2
2. 1 and 4
3. 2,3 and 4
4. 1,2,3 and 4