Read the article in Appendix A “Example of a Randomized Clinical Trial” (Nyamathi et al.,2015),Step 2 Discuss the following questions related to the article found on ~p. 162 under Critical Appraisal Criteria:1. Is the type of design used appropriate? Your rationale?2. What are the threats to internal and external validity?3. Is the design appropriately linked to the evidence hierarchy?Cite any sources in APA format.