With reference to NC machine, which of the following statement

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With reference to NC machine, which of the following statement is wrong?

1. Both closed loop and open loop control systems are used
2. Paper tapes, floppy drives and cassettes are used for data Storage
3. Digitisers may be used as interactive input devices
4. Post-processor is an item of hardware

Correct Option: D

Post-Processor is not used in NC machine.