In your solution design, you want to use PCF components. 
What two types of PCF components can you use with the apps?

Answer options:

A.Custom field control
B.Form Processor
C.HTML Text control
D.Custom dataset control
E.Vertical gallery

Correct Answers: A and D 
The Components are reusable blocks that help you develop the Power Apps applications. Power Apps provides out-of-the-box standard controls (components) for creating applications, like HTML Text, Vertical Gallery, or Edit Form. However, Power Apps also offers tools to create and reuse the custom components if your Power Platform solution requires more than standard controls. Power Apps Component Framework (PCF) is a foundation for building these components. 
There are two common types of components that you can create and use in your application using PCF: Custom field control on a form, like using a slider instead of the input box.
Custom dataset control, like creating a day planner control with appointments to drag and drop.
Option B is incorrect because Form Processor is AI Builder control and not the Power Apps component.
Option C is incorrect because HTML Text is a standard Display control.
Option E is incorrect because Vertical Gallery is a standard Layout control.
For more information about Power Apps PCF components, please visit the below URLs: 

https://docs.microsoft.com/en-us/learn/modules/get-started-component-framework/1-introduction
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/create-component
https://docs.microsoft.com/en-us/powerapps/developer/component-framework/overview