Which of the following are fertile materials?
(a) $U^{233}$ and $Pu^{239}$
(b) $U^{238}$ and $Th^{239}$
(c) $U^{238} and Th^{232}$
(d) $U^{235} and Th^{236}$
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$U^{233}$ and $Pu^{239}$