An insurance company wants a mobile solution for estimators with step-by-step guidance to create and file a car accident report. Estimators should use their mobile phone cameras to photo the car damage and upload pictures along with the report submission. After the report is filed and the case is created, an insurance officer receives an email notification and opens the case in the admin app at the office. The car owner can use the insurance portal to view the case progress. The company invites you as a Solution Architect to help them with the solution design. 
Please select the Power Platform application and services that you would recommend for the estimators’ solution.

Answer options:

A.A canvas app with an embedded model-driven component, Power Automate, Business Process flow
B.A canvas app, Business process flow, Power Automate
C.A model-driven app with embedded canvas app component, Power Apps portal
D.A canvas app, Business process flow, Web API, Power Automate
E.A model-driven app, Business process flow, Power Apps portal

Correct Answer: D 
As a Solution Architect, you need to know what Power Apps type best suits the customers’ requirements. 
There are three types of Power Apps applications: Model-driven — responsive Dataverse data-driven applications. This type is more data administration with a back-office and process focus.
Canvas — flexible phone or tablet applications that can use multiple data sources. The canvas app is focused on the end-user and helps to execute a particular task. It also provides device integration, like the use of the mobile camera.
Portal — external websites for interaction with Dataverse data. It has the end-user focus.
The estimators use mobile phones for step-by-step guidance and camera integration. Their applications should be canvas app. The business process flow provides step-by-step instructions. Currently, there is no direct integration of the Business process flow with a canvas app. However, you can use the Dataverse Web API to access the Business process flow’s steps and stages. You need to create a Business Process flow and then use Web API or create a custom connector for BPF data presentation in the canvas app. After the case submission, the canvas app can invoke the Power Automate automated flow for the insurance officer notification and the next steps. 
Your architectural solution should not be monolithic. But it should not contain a lot of small apps either. You need to find the best composition for your solution between three main Power Apps types, Dynamics 365 functionality, components, and other AppStore apps. 
All other options are incorrect. 
For more information about the Power Apps composition, please visit the below URLs: 

https://docs.microsoft.com/en-us/learn/modules/power-apps-architecture/3-composition
https://powerapps.microsoft.com/en-us/blog/using-business-process-flows-in-a-canvas-app/