The bookstore must be scalable, with the following specific requirements:

a$.$ The bookstore must be capable of maintaining user accounts for up to $100,000$ customers in its first six months, and then a further $1,000,000$ after that.

b$.$ The bookstore must be capable of serving up to $1,000$ simultaneous users after six months$).$

c$.$ The bookstore must be able to accommodate up to $100$ search requests per minute minute after six months$).$

d$.$ The bookstore must be able to accommodate up to $100$ purchases per hour $(1,000/$hour after six months$).$

a$)$ Draw a complete UML Use Case diagram.

b$)$ Write a detailed description for the "Moderate review" use case.

c$)$ Draw a sequence diagram for the following use cases: "view book details"

d$)$ Draw UML Class Diagram.

e$)$ Draw a UML State diagram for the "review" object.

f$)$ Draw and activity diagram for the system