Which of the following is an example of Commensalism?

Cattle egret and grazing cattle.

Cattle egret and grazing cattle.Option 1 is correct .

Commensalism is the interaction in which one species is benefited and the other is neither harmed nor benefited. 

The cattle egret and grazing cattle in close association, is a classic example of commensalism. The egrets always forage close to where the cattle are grazing because the cattle, as they move, stir up and flush out insects from the vegetation that otherwise might be difficult for the egrets to find and catch.