Which of the following statements is correct?下列哪个语句是正确的？
选项：

A:GUI of a target software system should be designed before its architecture design;
B:Surely a good design is very important and necessary for the success of the target software system.;
C:A good programmer can design the target software system while coding. So, if good programmers are available, design won't be necessary.;
D:Whether design is necessary or not is up to each software organization.