Which combination of the following features will suffice to characterize an OS as a multi programmed OS ?(i) More than one program may be loaded into main memory at the same time for execution.(ii) If a program waits for certain events such as I/O, another program is immediately scheduled for execution.(iii) If the execution of a program terminates, another program is immediately scheduled for execution.

• A. (i) only
• B. (ii) and (iii)
• C. (i) and (iii)
• D. (i), (ii) and (iii).