A. The Use Default If Unwired is the main key there.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions Unofficial Forum Rules and Guidelines "Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5
Is it an assumption that there is no connection in the enable pane?
If there is some connection in the enable pane, the result will depend on those connections.
The output tunnel shows that nothing is in the Enabled case here. If there was something wired, the output tunnel would be completely filled in.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions Unofficial Forum Rules and Guidelines "Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5