以下可以正确获取结果集的有（ ）

A. Statement sta=con.createStatement(); ResultSet rst=sta.executeQuery(“select * from book”);
B. Statement sta=con.createStatement(“select * from book”); ResultSet rst=sta.executeQuery();
C. PreparedStatement pst=con.preparedStatement(); ResultSet rst=pst.executeQuery(“select * from book”);
D. PreparedStatement pst=con.preparedStatement(“select * from book”); ResultSet rst=pst.executeQuery();