What's the best way to deal with repeat questions on musing.io?

(a) Do nothing. Repeat questions aren't a problem.
(b) Moderators block answers to repeat questions and redirect to the original question.
(c) Merge repeat questions and their answers with the original question.
(d) Use an SMT / reputation system, with repeat questions discouraged by a loss of musing reputation level and / or lower future SMT earning potential.
(e) Have a pop-up of all similar questions when a new question is raised.
(f) other