Which type of homebrewer is best for 8 ppm of dissolved oxygen in solution?

Which type of homebrewer is best for 8 ppm of dissolved oxygen in solution? Correct Answer Splashing and shaking

Homebrewers have several aeration/oxygenation methods available to them: siphon sprays, whipping, splashing, shaking, pumping air through a stone with an aquarium pump, and injecting pure oxygen through a sintered stone. Pumping compressed air through a stone is not an efficient way to provide adequate levels of DO. Traditional splashing and shaking, although laborious, is fairly efficient at dissolving up to 8 ppm oxygen. To increase levels of oxygen, the carboy headspace can be purged with pure oxygen prior to shaking.

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Following is an ecosystem of water-body, showing the concentration of DDT in each trophic levels. Water →  Algae → Fish → Pelican bird 1700 ppm → 500-600 ppm → 77 ppm → 0.2 ppm Which of the following feature is incorrect if the above is to represent biomagnification?