Which of the following statements are correct with respect to the “plate tectonics”?

1. A tectonic plate is a massive, irregularly-shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.

2. Radioactive decay and residual heat beneath the plates move the crustal plates.

3. Plates move horizontally and vertically over the asthenosphere.

Select the correct answer using the code given below:

Options