Security in CMS: Exploring Vulnerabilities and Suggesting Plugins for Securing Wordpress CMS Websites

write me exactly 1,500 words of these three topics with added research  unAI detected and no Plagiarism: 1.  Security in CMS: Explore 3 major security vulnerabilities and threats in various CMS platforms. Suggest and discuss 3 plugins for securing Wordpress CMS websites. 2. A/B Testing for websites: Identify 3 techniques that can be used in a website and discuss each one of them. 3. CMS and SEO: Analyze the SEO capabilities of different CMS platforms. Investigate how CMS choices impact search engine rankings, propose 3 SEO plugins for Wordpress CMS.