How do you configure the application to display a field for entering a mobile phone number only when the check box is selected?

Users can select a check box to subscribe to a text messaging service. Selecting the check box displays a field for a user to enter a mobile phone number.

How do you configure the application to display a field for entering a mobile phone number only when the check box is selected?
A . Use a when condition in a data transform to determine whether to show the mobile phone number field.
B . Use a when condition in the flow to branch the flow based on case data.
C . Use a circumstance on the check box property to create a rule variant that is effective when the check box is selected.
D . Use a when condition in the UI form to determine whether to show the mobile phone number field.

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Answer: D