In Microsoft Visual Studio 2017 Create an application named PhotoDemoApp that demonstrates the work of three related classes for a company that develops photographs. Create a class named Photo that includes fields for width and height in inches and properties for each field. Include a protected price field, and set it to $3.99 for an 8-inch by 10-inch photo, $5.99 for a 10-inch by 12-inch photo, and $9.99 for any other size (because custom cutting is required). The price field requires a get accessor but no set accessor. Also include a ToString() method that returns a string constructed from the return value of the objects GetType() method and the values of the fields. Derive two subclassesMattedPhoto and FramedPhoto. The MattedPhoto class includes a string field to hold a color, and the FramedPhoto class includes two string fields that hold the frames material (such as silver) and style (such as modern). The price for a MattedPhoto increases by $10 over its base cost, and the price for a FramedPhoto increases by $25 over its base cost. Each subclass should include a ToString() method that overrides the parent class version. Use NUnit to test all classes.