Phản ứng nào sau đây là phản ứng phân hạch?

\(_1^2{\rm{H}} + _1^2{\rm{H}} \to _2^4{\rm{He}}\).

\(_0^1{\rm{n}} + _{92}^{235}{\rm{U}} \to _{39}^{95}{\rm{Y}} + _{53}^{138}{\rm{I}} + 3_0^1{\rm{n}}\).

\(_1^2{\rm{H}} + _1^3{\rm{H}} \to _2^4{\rm{He}} + _0^1{\rm{n}}\).

\(_{84}^{210}{\rm{Po}} \to _{82}^{206}\;{\rm{Pb}} + _2^4{\rm{He}}\).