Each of the following statements concerning Strongyloides stercoralis is correct EXCEPT:

  •  S. stercoralis undergoes a free-living life cycle in soil.
  •   Migrating larvae of S. stercoralis induce a marked eosinophilia.
  •  S. stercoralis is acquired by ingestion of eggs.
  •  S. stercoralis produces filariform larvae.