Tick out the odd combination (a) cu, ag, au (b) na, k, rb (c) zn, cd, hg (d) f, si, i
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Qeerttyuipjgitigiflhfupdtulri6ldildi6dkydi6doydoyryodldp7fludelydpyrlydlydp7tlyrp6ekysi5wiw5eo6e
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