Given this fragment from a Java EE deployment descriptor： 124. <welcome-file>beta.html</welcome-file> 125. <welcome-file>alpha.html</welcome-file> And this request from a browser：http：//www.sun.com/SCWCDtestApp/register Which statement is correct，when the container receives this request？（）
- AThis deployment descriptor is NOT valid.
- BThe container first looks in the register directory for beta.html.
- CThe container first looks in the register directory for alpha.html.
- DThe container first looks for a servlet mapping in the deployment descriptor.