以下程序正确的是_____ A: B: include<;stdio.h>;int gNum;gNum=13;void main(){printf("%d\n", gNum);} C: D: include<;stdio.h>;void main(){int rob=17;printf("rob=%d\n", rop);}int rop=71; E: F: include<;stdio.h>;void main(){extern int outer;printf("outer=%d\n", outer);}int outer=33; G: H: include<;stdio.h>;void main(){extern int outer=33;printf("outer=%d\n", outer);}int outer=33;