The nucleus of a radioactive isotope belonging to an element releases an $\alpha$-particle. Next, the daughter nucleus produced then releases a $\beta^-$ particle, and after that the daughter nucleus from this decay releases another $\beta^-$ particle. Which statement describes the final nuclide that is produced?
- AIt is a different isotope of the original element.
- BIt is a nuclide of a different element of higher proton number.
- CIt is a nuclide of the same element but with different proton number.
- DIt is identical to the original nuclide.