hey ,@S L​  According to you , you have normal table table A and DLT table Table B , so it will give thrown an error that your upstream table is not streaming Live table and you need to create streaming live table Table a , if you want to use the output of that table to Table B .

then 3rd option , it will not throw any exception and will work as per my understanding , because your source can be a DLT table if you are using that table output to the normal table .

4th option will again give an error , because your source is not a DLT table and you are using the output of the source to the DLT table , which is not possible , i think