529 savings plans are state-sponsored education savings accounts that offer tax-advantaged growth. Key features include:

Contributions are not federally tax deductible (some states offer state-level deductions).

No income limitations for contributions.

The account owner, not the beneficiary, controls the plan.

Assets can be transferred tax-free to another family member’s 529 plan.

D is correct because tax-free rollovers are allowed for family members of the current beneficiary.

A is incorrect as contributions are not universally tax deductible.

B is incorrect as there are no income limitations for contributing.

C is incorrect because the account owner, not the beneficiary, controls the assets.