Which strategy with a historian most likely use to determine whether a source is valid

What university did albert einstein go to?

For witch of these skills were early bantu noted? check all that apply farming fishing hunting ironworking seafaring

Why might the spanish government have approved of the encomienda system? a the system allowed for fair treatment of all under it, leading to a happy and prosperous colony. b the system used natives as slaves which meant the government was able to maximize their profit of exported goods. c the system allowed for mostly profitable trade within the different colonies. d the system was a great example of how to successfully run a colony, making spain a world power.