Ramadan 2019: Is Ramadan Mubarak or Ramadan Kareem the correct greeting?

Which is correct: Ramadan Kareem or Ramadan Mubarak?""gulfnews.comWhat is the difference between Ramadan Mubarak and Ramadan Kareem?""Metro.co.ukRamadan Mubarak 2019: Best Wishes, SMS, Quotes to Share With Your Loved Ones""News18Ramadan Mubarak: Ramzan Wi