Who was the richest banker in Italy?

Giovanni Medici

Explanation: The Medici bank, which Giovanni Medici founded in 1397, was the most famous Italian bank. It was Europe's largest and most valued bank. Some estimates suggest that the Medici family was Europe's richest family for a period of time.

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option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

an unexpected salary cut