The fact that a system has a register where CPU will keep on checking for the status of device tells us that the process involve Select one: O A program controlled I/O OB. memory mapped I/O O polling OD. Direct Memory Access Which statement(s) about Test-and-set solution for Critical Section Problem below isare TRUE? 1. It is deadlock-free II. It is starvation free III. It ensure processes enter CS in FIFO order IV. More than one process can enter CS at the same time without causing race condition problem. Select one: O A. IV only OB. I only OC II and III OD. I and