please explain the questions in easy words with diagrams because i am not understanding.

The name of the subject is Distributed Operating System

8. (a) For active replication to work in general, i is necessary that all operations be carried out in the same order at each replica. Is this ordering always necessary? (b) Discuss the multicopy update problem reference to question 8(a). 9. (a) Object-based distributed shared memory systems allow processes on different machines to communicate through passive shared objects. Discuss the problems with implementing shared objects in Object Based DSM. (b) Explain the differences between absolute ordering, consistent ordering and causal ordering of messages. 8. (a) For active replication to work in general, i is necessary that all operations be carried out in the same order at each replica. Is this ordering always necessary? (b) Discuss the multicopy update problem reference to question 8(a). 9. (a) Object-based distributed shared memory systems allow processes on different machines to communicate through passive shared objects. Discuss the problems with implementing shared objects in Object Based DSM. (b) Explain the differences between absolute ordering, consistent ordering and causal ordering of messages