Star Trek: Number One Mystery Cache

Caching: The finder's frontier.  These are the voyages of the caching explorers.  Their life-long mission: to explore strange new towns, to seek out new caches and new hiding spots, to boldly go where no muggle has gone before.

This Star Trek Geoart is a tribute for Trekkies and non Trekkies all around. Answer the questions to find the final coordinates for each cache in the series. Cache is not at the posted coordinates. Enjoy!

Number One

William Thomas Riker was a noted Starfleet officer, perhaps best known for his long assignment as first officer under Captain Jean-Luc Picard aboard the USS Enterprise-D, and later the USS Enterprise-E. In 2379, he finally accepted a promotion as captain of the USS Titan. For the first two seasons, Riker is portrayed as bold and confident, an ambitious young officer; however, over time Riker's character becomes more reserved, as experience teaches him the wisdom of a patient, careful approach.  Riker retains a willingness to occasionally disregard the chain of command.   He is usually (and informally) called "Number One" by Captain Picard, because of his position as first officer on the Enterprise. - wikipedia

QUESTION FOR FINAL COORDINATES: Riker is mostly known by what name to his crew-mates on the Enterprise? 

A. Will - N39 22.761 W087 28.182

B. Willy - N39 22.245 W087 28.986

C. Bill - N39 22.145 W087 28.223

D. Billy - N39 22.891 W087 28.454