Problem: Quantitative research designs are used to answer different types of research questions and to test different types of hypotheses. Grand Canyon University (GCU) has a set of quantitative core designs, found on the DC Network. Review the "GCU Quantitative Core Designs" document so you can contrast the GCU quantitative core designs. What are the defining characteristics of each design? How do they differ from one another? What are some advantages and disadvantages of each design? How might researchers select the most appropriate design for their research questions? Support your view including references.