Question

which of the following is a type of plate boundary?
subduction boundary
separation boundary
transform fault boundary

Explanation:

Plate boundaries are classified into three main types: divergent (where plates move apart), convergent (where one plate is subducted under another), and transform (where plates slide past each other). A transform fault boundary is one of these recognized types. Subduction is a process that occurs at convergent boundaries, not a boundary type itself. "Separation boundary" is not a standard geological term for plate boundaries.

Answer:

transform fault boundary