What are blocks of time in the geological time scale called?

The block o time in the geological time scale are called:

Eon: The biggest ones

Eras: Which are the middle ones

Periods: Which are the smallest ones.

Explanation:

The geological time scale classifies the lapses of time in different gradients. It does it like that to optimize the retrieval of data and locate the objects and phenomenons of study to analyze them and conduct the research in an organized way. Eons are classified in Archean, Proterozoic, and Phanerozoic. Eras are classified in: Early archean, middle archean, late archean, Early proterozoic, Middle proterozoic, late proterozoic, Paleozoic, Mesozoic, Cenozoic. Periods are classified in Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Permian, Triassic, Jurassic, Cretaceous, Tertiary, Quaternary.

the answer would be d