Q: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Passage: KVOB started as KQNS-FM in September 1988, then located on 95.9 FM with an ERP of 1.3kW. At the time, the station carried an adult contemporary format. In 1994, B-B Broadcasting bought the station from Smoky Hill Broadcasting, and the following year, the station moved to 95.5 FM and upgraded their power to 15.5kW. By this time, the station flipped to a mainstream rock format, branded as "Star 95." In 1999, the station flipped back to adult contemporary, keeping the "Star 95" moniker. In 2004, the station began running the "Hits & Favorites" satellite feed from Citadel Media (now Cumulus Media Networks) and changed monikers to "Lite Rock 95.5". A year later, the station switched satellite feeds to Westwood One's AC feed, again keeping the "Lite Rock 95.5" moniker. In 2006, the station rebranded as "OZ 95", again keeping the AC format. In 2007, the station flipped to adult hits, branded as "Bob FM". The station was assigned the KVOB call sign by the Federal Communications Commission on December 1, 2007. A year later, the station switched to Sparknet Communications' national feed of "Jack FM", again retaining the adult hits format.
Link Information: In 2004, the station began running the "Hits & Favorites" satellite feed from Citadel Media (now Cumulus Media Networks) Answer: September 2011
A:
When did Citadel Media become Cumulus Media Networks?