Given: Which regular expression, in

Given: Which regular expression, inserted at line 12, correctly splits test into "Test A", "Test B", and "Test C"?（）

• AString regex=""；
• BString regex=" ."；
• CString regex=".*"；
• DString regex="\\s"；
• EString regex="\\.\\s*"；
• FString regex="\\w[\.]+"；