Arrange the following methods of delineating crop combination regions in order of their appearance: Doi's method, Rafiullah's method, Weaver's method, Coppock's method.

ADoi, Rafiullah, Weaver, Coppock

BRafiullah, Weaver, Coppock, Doi

CWeaver, Rafiullah, Doi, Coppock

DCoppock, Doi, Rafiullah, Weaver

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