It should be neither. The Give Way signs don't mean you can't stop, and if the driver feels he needs to stop in order to take in and process all the obs info including moving traffic, signs, road layout etc, then it's best that he does that at a Give Way than halfway round the RBT and have to switch lanes unnecessarily which could be more dangerous than a pause at the entrance. A competent and courteous driver would hopefully never assume that the driver in front is familiar enough with the road to know where he's going without having to look first, and so be ready to stop if/when the driver in front decides to. As someone else said "Drive such that you can stop within teh distance you can see to be clear" - note the lack of the word "assume" in that quote from Roadcraft. What WOULD be a fail under test conditions, is blasting your horn at someone who dared to stop at a Give Way.