Which one of the following geologic time designations from oldest to youngest is correct?
a. ____ Proterozoic-Archean-Hadean; b. ____ Archean- Hadean-Proterozoic; c. ____ Hadean-Archean- Proterozoic; d. ___ Phanerozoic-Precambrian-Komatiitic; e. ____ Archean-Proterozoic-Hadean.
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