Consider the following query plan. What is the cost in terms of number of I/Os for this plan? The table statistics are as follows. Maintenances: 1000 blocks; selection on planed = 100 returns 1/10 of the tuples Employees: 50 tuples. Consider the following query plan. What is the cost in terms of number of I/Os for this plan? The table statistics are as follows. Maintenances: 1000 blocks; selection on planed = 100 returns 1/10 of the tuples Employees: 50 tuples