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The default branch destination is used when NO OTHER logic (branching based on answers) gets triggered. This is the fallback logic that gets executed when no other logic gets triggered.
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Yes. We've updated the system to add this ability. If you choose the Default Branch to "Terminate" or "Thank You" then, unless the respondent chooses an option that triggers another logic, the system by default will execute the default logic.
Not at this time. We however anticipate adding this functionality soon. Currently you can only chain via the Answer option choice.