What are the possible sources of the information that defines the functional dependencies that hold among the attributes of a relation schema? discuss two possible sources. explain your answer.

What percentage of teens plays video games? a.97% b.100% c.74% d.50%

What need most led to the creation of the advanced research projects agency network? darpa wanted scientists to be able to collaborate and share research easily. darpa wanted american and russian politicians to be able to communicate. darpa wanted astronauts to be able to contact nasa and the white house. darpa wanted factory owners to be able to coordinate supply chains.

What should you do if a dialog box covers an area of the screen that you need to see?