The answer is (B)
Multitasking
in a network operating system is the ability to execute more than one process
or process at a time. Multitasking creates the appearance that multiple programs
are being executed at the same time, but in reality, only one program at a time
is being executed. The NOS switches the CPU time from one task or program to
another in order to create the appearance that several tasks are being executed
simultaneously, but in reality, only a single program is being executed
