云计算新课2-Spring中userDao的配置正确的是：（）
A<interface bean="bw.org.userDao">
B<id class="bw.org.userDao">
C<bean id=”userDao”class="or.zhangs.userDao">
D<bean interface="bw.org.userDao">
A<interface bean="bw.org.userDao">
B<id class="bw.org.userDao">
C<bean id=”userDao”class="or.zhangs.userDao">
D<bean interface="bw.org.userDao">