以下程序的运行结果是: 
#include
char *fun(char *px,char *py);
void  main( )
{
  printf("%s%s\n",fun("abc","abcd"),fun("1234","123"));
}
char *fun(char *px,char *py)
{
  return (*px > *py? px : py);
}
A、abcd1234
B、abc1234
C、abcd123
D、abc123