Zend certified PHP/Magento developer

EAV – Static and Varchar Entity – What is the common between both?

I need a help on one of the following question :

Q – EAV – Static and varchar entity type what is the similar in between
this ?

  • Both values can be identical for single sites
  • Both values can be duplicate for multiple sites
  • Can be add from the backend

Can Someone please help me on this ? I want to understand the answer.