Which is not one of the types of prototype of Prototyping Model?

Which is not one of the types of prototype of Prototyping Model?
1). Horizontal Prototype
2). Vertical Prototype
3). Diagonal Prototype
4). Domain Prototype

There is no such thing as Diagonal Prototype whereas other options have their respective definitions. The Prototyping Model is a systems development method (SDM) in which a prototype (an early approximation of a final system or product) is built, tested, and then reworked as necessary until an acceptable prototype is finally achieved from which the complete system or product can now be developed.

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