What is the role of the Andean condor in the ecosystem?

The Andean condor is a scavenger species that feeds on dead animals.
The Andean condor's main food is ungulate mammals, which were previously wild species and are currently exotic, from livestock activity.
As a scavenger species, the Andean condor prevents environmental and water pollution by pathogenic organisms.
a) Only I is correct.
b) I and II are correct.
c) I and III are correct.
d) I, II, and III are correct.