estion $(37$ Marks$)$

A$.$ List and explain any $6$ parts of the PCB $12$ Marks

B$.$ With the aid of a diagram, explain the various process states of an operating $15$ Marks.

C$.$ The definition of operating systems varies according to various authors, but these definitions always have characteristics and attributes that serve as a base line that are consistent in the general definition of it$.$ The consistency in attributes include OS functions, OS operations, OS concept, performance, and security. How can the operating system views$/$ perspectives be used to adequately describe the understanding of Operating systems? $(10$ Marks$)$