Masses of two isobars \( { }^{64}{ }_{29} \mathrm{Cu} \) and \( { }^{64}{ }_{30 \mathrm{Z}} \) are \( 63.9298 \mathrm{u} \) and \( 63.9292 \mathrm{u} \) respectively. It can be concluded from these data that :
(A) Both the isobars are stable
(B) \( { }^{64} \mathrm{Zn} \) is radioactive, decaying to \( { }^{64} \mathrm{Cu} \) through \( \beta \)-decay
(C) \( { }^{64} \mathrm{Cu} \) is radioactive, decaying to \( { }^{64} \mathrm{Zn} \) through \( \gamma \)-decay
(D) \( { }^{64} \mathrm{Cu} \) is radioactive, decaying to \( { }^{64} \mathrm{Zn} \) through \( \beta \)-decay
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