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.
What is the relationship between 'Magic Quadrant' and 'Gartner' in the context of the input sentence.
Options: owned by, manufacturer, stock exchange, operator