Answer:
Because of the nature of the source systems ETL functions are challenging.Reasons are as following:-
1. There are various source systems are very and contrasting.
2. There is usually a requirement to deal with source systems on different platforms or Operating Systems.
3. Quality of data is uncertain in many old source systems that have developed gradually over time.
The device that work essentially like a pen and paper, allowing the user to input drawings on a computer is graphic tablet. The first option is correct.
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