The following code ensures that an address ID CANNOT be used if it is already...

In the given scenario, the correct way to ensure that an error message is displayed on the address ID form field when an invalid address ID is entered is:

A. addressForm.invalidateFormElement("addressid");This method call specifically targets the form element associated with the address ID and marks it as invalid, which triggers the display of the associated error message. This approach is direct and ensures that the user is immediately informed about the invalidity of the entered address ID, enhancing the user experience and form validation process.