a) each process is blocked and will remain so forever
b) all processes are trying to kill each other
c) each process is terminated
d) none of the above

Answer: a
Explanation: Deadlock is a situation which occurs because process A is waiting for one resource and holds another resource (blocking resource). At the same time another process B demands blocking a resource as it is already held by a process A, process B is waiting state unless and until process A releases occupied resource.