Which is a symbiotic union?

Question

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A symbiotic union is a mutually beneficial relationship between two different species. The crocodile provides a habitat for the birds to feed on its pests, and in return, the birds keep the crocodile clean and pest-free. This is a classic example of a symbiotic union. Option A refers to a human relationship, which is not a biological concept. Option B is vague and does not describe a specific example. Option D refers to an example of a predator/prey relationship, which while important for ecological balance, is not a symbiotic union.

Which Is a Symbiotic Union