What should you do?

You need to modify the application to meet the product Id requirement. What should you do?
A. Modify the RegisterGlobalFilters method of the Global.asax.cs file as follows.Contract.Assume<ArgumentException>(productId != 0);
B. Modify the GetDealPrice method of ProductController as follows.Contract.Requires<ArgumentException>(productId > 0);
C. Modify the RegisterGlobalFilters method of the Global.asax.cs file as follows. Contract.Requires<ArgumentException>(productId > 0);
D. Modify the GetDealPrice method of ProductController as follows.Contract.Assume<ArgumentException>(productId != 0);