Correct Answer:
B. Adoption by registered deed
For an adopted child to be legally recognized as a descendant with full inheritance rights, the adoption process must typically follow specific legal procedures, often involving formal documentation and registration. Option B: 'Adoption by registered deed' is accurate because for an adopted son to be legally recognized as a descendant with full rights, including succession, the adoption process must be formalized through a registered deed. This legal document provides conclusive proof and validity to the adoption, ensuring its legal standing.
- Option A: 'Collector approves' might be part of an administrative process but is not the primary legal instrument for validating adoption.
- Option C: 'Lived 10 yrs' refers to a duration of cohabitation, which might be a factor in some informal recognitions but not the formal legal basis for adoption.
- Option D: 'Govt notification' is too broad and not the specific legal instrument for individual adoptions.