Which of the following stores only one type of data and I specific location and less contagious and that you meeting it cannot be null

Answer 1

Based on the given criteria, the following store only one type of data, in a specific location, and meeting it cannot be null:

- Database+ Their cards are located in one specific place, and they store only one type of data, making it less contagious. Moreover, in case of meeting, there should be no null value.