Which two code segments can you use?

An organization uses Dynamics 365 Sales. You plan to add a custom button to the app ribbon.
You need to ensure that the button displays only when conditions specified by business rules are met.
Which two code segments can you use? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
A. gridContext.refresh();
B. formContext.ui.refreshRibbon(refreshAll);
C. formContext.data.refresh(save).then(successCallback, errorCallback);
D. formContext.ui.refreshRibbon();
E. formContext.getControl(arg).refresh();