The following figure shows the log corresponding to a particular schedule at the point of a system crash for four

transactions T$1,$ T$2,$ T$3,$ and T$4.$ Suppose that we use immediate update protocol with check$-$pointing. Describe

the recovery process from the system crash. Specify which transactions are rolled back, which operations in

the log are redone and which are undone and whether any cascading rollback takes places