Please answer it 30 mnt. time short

QUESTION 2 a) Consider two cooperating processes share a memory location. State the advantage and disadvantage of using Lock to restrict the processes to access into the critical section. Discuss how the problem of using Lock can be solve. (6 Marks) b) Let us say a branch office requests for a service to the head office. Explain the communication mechanism that takes place between the computers at the branch office and the head office