General Knowledge Science Technology and Inventions

Consider the following :

1. Aarogya Setu

2. CoWIN

3. DigiLocker

4. DIKSHA

Which of the above are built on top of open-source digital platforms?

1

1 and 2 only

2

2, 3 and 4 only

3

1, 3 and 4 only

4

1, 2, 3 and 4

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