A developer created a Visualforce page and a custom controller with methods to handle different buttons and events that can occur on the page. What should the developer do to deploy to production?

A. Create a test class that provides coverage of the Visualforce page.
B. Create a test page that provides coverage of the Visualforce page.
C. Create a test page that provides coverage of the custom controller.
D. Create a test class that provides coverage of the custom controller.

Suggest answer: D

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