Roger Sells Farm Equipment

Roger sells farm equipment. About twice a month he visits Frank Copeland's farm. Copeland hasn't bought a new piece of equipment in twenty years, but he always seems to know who's in the market for Roger's farm equipment. Copeland likes to gossip and shares his information with Roger freely. Frank Copeland would be a good example of a:

A) bounce-back
B) spiff
C) center of influence
D) free canvasser
E) spotter