Software design is a (66) process. It requires a certain (67) of flair on the part of the designer. Design can net be learned from a book. It must be practiced and learnt by experience and study of existing systems. A well (68) software system is straight forward to implement and maintain, easily (69) and reliable. Badly (68) software systems, although they may work are (70) to be expensive to maintain, difficult to test and unreliable.

68（）

A．design

B．designed

C．designing

D．designs

若有语句　　int i=-19,j=i%4;　　printf("%d\n",j);　　则输出的结果是【 】。