During conjugation in $Paramecium$,which of the following events occurs?
- AOut of the four micronuclei formed,three nuclei degenerate.
- BOut of the twelve macronuclei formed,four nuclei degenerate.
- CZygote nucleus undergoes eight successive divisions in each conjugant.
- DOut of the sixteen nuclei formed from zygote,$12$ become macronuclei and $4$ micronuclei.
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