In the context of the input sentence, determine the relationship between 'Magic Quadrant' and 'Gartner'.
Options: creator, original broadcaster, operator, headquarters location

RingCentral , Inc. (NYSE:RNG), a leading provider of cloud business communication solutions, today announced that Gartner has recognized RingCentral as a leader in the Magic Quadrant for Unified Communications as a Service (UCaaS) Worldwide published on September 3, 2015.
creator