Which of the following is the oldest of the eras that make up the geological time scale?

Question

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The Hadean era is the oldest era that makes up the geological time scale, dating back to 4.6 billion years ago. It is followed by the Archean and Proterozoic eras, which make up the Precambrian period. The Paleozoic, Mesozoic, and Cenozoic eras are more recent, starting around 541 million years ago, 252 million years ago, and 66 million years ago, respectively.

Which of the Following Is the Oldest of the Eras