In a radioactive decay chain, the initial nucleus is `overset(232)(90).^(Th)`. At the end there are 6 `alpha`-particles and 4 `beta`-particles which are emitted. If the end nucleus is `overset(A)(Z).^(X),A` and Z are given by :
A. `A=208 , Z=80`
B. `A=202 , Z=80`
C. `A=208 , Z=82`
D. `A=200 , Z=81`
