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