3. Use the pyramid diagram below to help you review what you have read. Arrange the steps in the replication process of the retrovirus in the correct order by placing the letters below next to the numbers on the pyramid.a. DNA is made from viral RNAb. Virus enters cellC. Host cell and provirus reproduce; new virus formsd. Viral DNA (provirus) integrates into host cell's chromosomes1.2.3.4.