Which statement is unnecessary inside the unit test for the custom controller?

a developer has a single custom controller class that works with a visualforce wizard to support creating and editing multiple sobjects. the wizard accepts data from user inputs across multiple visualforce apges and from a parameter on the initial url.

a. public extendedcontroller(apexpages. standardcontroller cntrl){}
b. apex. pages.( input , testvalue );
c. test. setcurrentpage(pageref);
d. string nextpage =controller.();