The correct option is D All of the above
The nanomaterials are classified into
nanolayers, nanotubes or nanowires and nanoparticles.
Nanolayers are the nanomaterials with only one dimension between 1 nm and 100 nm.
Nanotubes or nanowires are the nanomaterials with two dimension between 1 nm and 100 nm.
Nanoparticles are the nanomaterials with three dimension between 1 nm and 100 nm.