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Que. Which combination of the following features will suffice to characterize an OS as a multi-programmed OS?

(a) More than one program may be loaded into main memory
at the same time for execution.
(b) If a program waits for certain events such as I/O,
another program is immediately scheduled for execution.
(c) If the execution of program terminates, another program
is immediately scheduled for execution.
a. a
b. a and b
c. a and c
d. a, b and c
Answer:a and b
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