1. Compare analog and digital systems. Which of the following statements are not true?
   1. In analog systems, waves are used in their original form, but in digital systems waves are sampled at certain intervals and recorded as numbers
   2. Both Analog and Digital systems consist of continuous signals.
   3. Unlike analog duplication, digital copies are exact replicas.
   4. For the same set of inputs, digital systems will always produce same output, but analog systems output may vary with external conditions such as temperature.
   5. Compared to analog systems, digital systems can be easily designed and manufactured.
   6. Compared to analog data, digital data cannot be encrypted easily.
   7. Compared to digital signals, analog signals will not be easily distorted due to noises.