You create a canvas app screen Screen1. You add a TextInput control (named TextInputFld) and a Button (named ButtonAdd). You set the TextInput field Default property to empty. 
You need to be sure that when a user enters the text in TextInputFld and clicks the ButtonAdd, the app would store the input and clears the TextInput field for the new entry. 
What function should you use to clear the TextInputFld?

Answer options:

A.TextInputFld.Clear
B.Reset(Screen1)
C.Reload(TextInputFld)
D.Reset(TextInputFld)
E.Clear(TextInputFld)

Correct Answer: D 
If you need to set a control back to the Default property, you use Reset (Control). Reset(TextInputFld) is resetting a control to the Default property. You can also use ResetForm(FormName). But it will reset all the controls on your form. Or you can set a control’s value to empty using a variable. 
All other options are incorrect. 
For more information about canvas app formulas, please visit the below URLs: 

https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/working-with-formulas
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/functions/function-reset
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/functions/function-form