Which one is the correct interaction sign for Commensalism?

Which one is the correct interaction sign for Commensalism? Correct Answer +/0

Type of Interaction Sign Effects Mutualism +/+ both species benefit from interaction Obligate Mutualism +/+ obligatory; both populations benefit Commensalism +/0 one species benefits, one unaffected Neutralism 0/0 populations do not affect one another Amensalism 0/- One species is disadvantaged/one species unaffected.

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