Which scientific product innovation technique was used to first isolate graphene, earning its discoverers the 2010 Nobel Prize in Physics?

Graphene, the wonder material consisting of a single layer of carbon atoms arranged in a hexagonal lattice, has revolutionized multiple industries since its discovery. With its extraordinary strength (200 times stronger than steel), exceptional electrical conductivity, and remarkable flexibility, graphene has enabled innovations across electronics, medicine, energy storage, and materials science. Test your knowledge about this groundbreaking scientific product that's changing our technological landscape.

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Peeling layers from graphite using ordinary adhesive tape (the 'Scotch tape method')
Chemical vapor deposition on copper substrates
Epitaxial growth on silicon carbide through thermal decomposition
Reduction of graphene oxide using hydrazine compounds