A Blue Prism solution works fine when developing and testing it in Process and Object studio but when it is running in C

[answerhappygod]

A Blue Prism solution works fine when developing and testing it in Process and Object studio but when it is running in Control Room exceptions occur because of screen elements not being found.
What is the most likely cause?

A. The most likely cause for the errors is that your application has changed.
B. The most likely cause for the errors seen in Control Room is that best practice use of wait stages has not been followed.
C. The most likely cause for the errors is that the Object Studio action has not been published and therefore cannot be used by the Process in control room.
D. The most likely cause for the exceptions is that best practice exception handling has not been incorporated into the Process.