Utilize the input text as a context reference, choose the right relationship between 'Magic Quadrant' and 'Gartner' from the options.
Options: operator, manufacturer, stock exchange, owned by

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.
owned by