If you want to find out parent and child relationship in the same table as Product and Sub Product or who reports to who kind of tree-based reports what method of joining techniques you would use. And provide answer with examples.

Draw a Sequence Diagram to show the steps of viewing final grade of one course through edugate-Portal. please give me best correct answer

I asked this question on Bartleby but didn't get a very clear response, I would like further explaination please. The answer on Bartleby said that it would be none of the options but didn't really explain why.  What is the cardinality of the 'writes' relationship type? a) One-to-many b) Many-to-many c) One-to-one d) None of the other options   My thought process was that it would be b) Many-to-many since: A person writes many books. And one book is also written by many people. Thus the relationship will be many to many. One to many would mean that one instance is related to many other instances. For example, the address of a house contains many people living in the house. One to one would mean that one instance is associated with only one other instance. For example, one employee will have one unique ID in an organization. So why is the answer none of the other options?

After everything is said and done, what will Al be used for? Explain briefly the main groups and provide two examples for each.