关于OMC中X2和S1口的配置，以下说法正确的是________. | About the configuration of S1 and X2 interface in OMC, which statement is RIGHT? ________
A.S1口和X2口都需要手工进行配置 | Both S1 and X2 configuration are done by hand.
B.S1口和X2口都不需要手工进行配置，OMC可以自动添加 | Both S1 and X2 configuration are done by OMC automatically.
C.只有S1口需要手工进行配置，OMC可以自动添加X2 | Only S1 interface configuration are done by hand. OMC can config X2 automatically.
D.只有X2口需要手工进行配置，OMC可以自动添加S1 | Only X2 interface configuration are done by hand. OMC can config S1 automatically.
正确答案是A