Answer: All child objects that do not have an explicit retention period will automatically inherit the new retention period.

The correct answer is B because when a schema's data retention period is modified, only child objects without explicit retention settings inherit the new period. Objects with explicit retention periods (like table T_B in the community test) remain unchanged, which aligns with option D. However, since the question asks for a single answer and B encompasses the inheritance behavior for non-explicit objects while implying that explicit ones are unaffected, B is the optimal choice. Option A is incorrect as not all child objects retain the new period (explicit ones don't), and option C is wrong because explicit periods are not overridden. The community discussion, including upvoted comments and test results, confirms that B is correct, with some noting D is also valid but B is preferred for single-answer selection.

Author: LeetQuiz Editorial Team