Select all the correct statements about two modes of CPU operation

Question

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There is an instruction like 'iret' to return from kernel mode to user mode

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The two modes are essential for a multiprogramming system

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The two modes are essential for a multitasking system

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The software interrupt instructions change the mode from user mode to kernel mode and jumps to predefined location simultaneously

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Some instructions are allowed to run only in user mode, while all instructions can run in kernel mode

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