Masses of two isobars $\;_{29}^{64}Cu\;$ and $\;_{30}^{64}Zn\;$ are 63.9298n and 63.9292n respectively.It can be concluded from these data that

Question

$(a)\;both\;the\;isobars\;are\;stable\qquad(b)\;^{64}Zn\;is\;radioaingctive\;,decaying\;to\;^{64}Cu\;through\;\beta-decay\qquad(c)\;^{64}Cu\;is\;radioactive\;,decaying\;to\;^{64}Zn\;through\;y-decay\qquad(d)\;^{64}Cu\;is\;radioactive\;,decaying\;to\;^{64}Zn\;through\;\beta-decay$