Which of the following are main types of plate boundaries?

The main types of plate boundaries are classified as divergent, convergent, and transform boundaries. These classifications are based on the interactions and movements of tectonic plates.

Divergent boundaries occur when two tectonic plates move away from each other, allowing magma from the mantle to rise and create new crust. This often forms mid-ocean ridges and is associated with volcanic activity.

Convergent boundaries happen when two plates collide. This can lead to one plate being forced under another in a process known as subduction, which can create mountain ranges or deep ocean trenches, and is often accompanied by significant seismic activity.

Transform boundaries are characterized by plates sliding past one another horizontally. This lateral movement can cause earthquakes and is exemplified by the San Andreas Fault in California.

The other options refer to various geological concepts or classifications that do not accurately depict the interactions between tectonic plates as main boundary types.