You are creating a canvas app in the Power Apps Studio. 
Please select all categories of possible errors that the App Checker service examines the app during your development process.

Answer options:

A.Connections
B.Performance
C.Formulas
D.Gateways
E.Accessibility
F.Runtime

Correct Answers: B, C, E and F 
Power Apps Studio App checker identifies possible app problems and errors during a development process. It monitors the problems and alerts users with a red dot on its 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: 

When you click on the error, the App Checker opens the Details panel (Number 1) for an issue (Number 2). It highlights the problematic place in the formula (Number 3). App Checker also provides recommendations on how to fix the problem (Number 4) and why you should fix it (Number 5). 

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