The second one.
Simply put, while one person may think that, another may not.
The reason time is important is b/c if there’s too much delay in between the U.C.S and the C.S the learner may not make the connection. For acquisition you must introduced the C.S and as soon as thats presented quickly introduce the U.C.S so there is an overlap between those two
This is why I will never smoke
Rays of heat that conduct the energy.