問題文
A reviewer opens the wrapper object again to trace where a target column came from. Nothing has been said in this object about which incoming ports feed which outgoing port, so the reviewer needs to know what the tool assumes in that silence. The same reviewer then wants to add a port that both takes data in and hands it on, and wants to know what the object has to be holding already before such a port can be made at all. Which reading of the pair is sound?
選択肢
- While nothing has been said about it, an outgoing port is taken to lean on one of the incoming ports, and a port that both takes data in and hands it on can be made once the object holds a group of each sort.
- While nothing has been said about it, an outgoing port is taken to lean on all of the incoming ports, and a port that both takes data in and hands it on can be made once the object holds a group of each sort.
- While nothing has been said about it, an outgoing port is taken to lean on one of the incoming ports, and a port that both takes data in and hands it on can be made once the object holds a group of that sort.
- While nothing has been said about it, an outgoing port is taken to lean on all of the incoming ports, and a port that both takes data in and hands it on can be made once the object holds a group of that sort.