You create a canvas app in the Power Apps Studio. The App Checker alerts you with the red dot about the problems in your app. 
What are the four categories of possible errors that the App Checker monitors?

Answer options:

A.Accessibility
B.Connections
C.Formulas
D.Performance
E.Connectors
F.Runtime
G.Code

Correct Answers: A, C, D and F 
Power Apps Studio App checker identifies possible app problems and errors during a development process. It monitors the issues and alerts users with a red dot on the stethoscope icon when an error or a problem occurs in your app (Number 1). A user can click on the App checker icon, and a new panel on the right side of the studio screen opens (Number 2). 
The App checker panel displays the five categories of problems and errors that App Checker tracks (Number 3): 

If you open the Formulas section (Number 1), the App checker presents the results by screen and splits the Formulas alerts into two categories: Errors (Number 2) and Warnings (Number 3). 

When you open the Error`s App section and click on one of the errors, the App checker opens the Details panel (Number 2) for the issue (Number 3). It highlights the problematic place in the formula (Number 1). Besides the issue description (Number 3), the App checker provides information about the possible cause for the issue (Number 4) and the error location in the app (Number 5). Also, on this panel, users can find the App checker`s recommendations on fixing the problem (Number 6) and link to the additional information relevant to the issue (Number 7). 

All other options are incorrect. 
For more information about the Power Apps App checker, please visit the below URLs: 

https://powerapps.microsoft.com/en-us/blog/powerapps-checker-now-includes-app-checker-results-for-canvas-apps-in-solutions/
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/accessibility-checker