Complete Problems 4 and 6 4) What are three types of blockchain? What are major differences among these block chains? 6) Recently, more than 20 percent of companies surveyed indicated they were testi

Complete Problems 4 and 6 

4) What are three types of blockchain? What are major differences among these block chains?

6) Recently, more than 20 percent of companies surveyed indicated they were testing or considering artificial intelligence applications in their business, but only 4 percent were actively using AI. Why do you think companies (a) are interested in AI and (b) are having trouble implementing AI? 

Minimum 1000 words, APA format 

Minimum 2 external references