Which of the following strategies enable non-acidophilic bacteria to endure lower pH environments?

Question

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All of the choices listed enable non-acidophilic bacteria to endure lower pH environments. 
Presence of internal buffers helps to maintain a more neutral pH internally. Proton pumps that pump H+ out of the cell help to maintain a neutral pH outside the cell. Synthesis of acid shock proteins help to protect other cellular proteins that might be otherwise denatured or damaged by the low pH.

Which of the Following Strategies Enable Non-Acidophilic Bacteria to Endure