Which of the following methods is least likely to help Alisha determine the age of sedimentary rock layers in her backyard? O Apply radiometric dating to determine the amount of radioactive isotopes in each rock layer. O Identify index fossils in sedimentary rock that have lived in a particular time in Earth's history. O Analyze seismic diagrams to determine how radioactive elements break down into stable elements. O Use relative dating techniques to determine how individual fossil groups are related to specific rock layers.​