Activated sludge should have the ability to settle quickly so that it can: a. be rapidly pumped back from sedimentation tank to aeration tank b.absorb pathogenic bacteria present in waste water while sinking to the bottom of the settling tank c.be discarded and anaerobically digested d.absorb colloidal organic matter. Please provide the answer with a plagiarism-free proper explanation. Kindly also refer to the NCERT 12th Biology.

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