下面选项中,可以将数据库 itcast 的编码修改为 gbk 的是 A. ALTER DATABASE itcast DEFAULT CHARACTER SET gbk COLLATE gbk_bin; B、 ALTER DATABASE itcast CHARACTER SET gbk COLLATE gbk_bin; C、 CREATE DATABASE itcast DEFAULT CHARACTER SET gbk COLLATE gbk_bin; D、 ALTER DATABASE itcast DEFAULT CHARACTER SET=gbk COLLATE gbk_bin; A、 ALTER DATABASE itcast DEFAULT CHARACTER SET gbk COLLATE gbk_bin; B. ALTER DATABASE itcast CHARACTER SET gbk COLLATE gbk_bin; C. CREATE DATABASE itcast DEFAULT CHARACTER SET gbk COLLATE gbk_bin; D. ALTER DATABASE itcast DEFAULT CHARACTER SET=gbk COLLATE gbk_bin;