SolarCity Corp. SCTY, +6.94% Chief Executive Lyndon Rive said he was "happy" about the merger between Vivint Solar Inc. VSLR, +44.76% and SunEdison Inc. as he expects a Vivint under SunEdison will step up its solar advocacy efforts.
Take context from the input text and decide on the accurate relationship between 'SolarCity' and 'Lyndon Rive' from the options provided.
Options: subsidiary, founded by, chief executive officer, legal form