$.$ Let there be three processes P$1,$ P$2$ & P$3$ running on node A$.$ After time t$1$ the process P$1$ is migrated to node B$.$ It reaches node B at time t$3.$ The process remains suspended between t$3$ & t$4.$ Which address transfer mechanism is used by distributed system if process P$1$ Continues execution on node A until time t$3?$