Question: In which commercial mixtape  by Gucci Manethe, Keith Cozar had a guest appearance?
Context: Droptopwop is a collaborative commercial mixtape by American rapper Gucci Mane and record producer Metro Boomin.  It was released on May 26, 2017 by Atlantic Records and 1017 Records to celebrate Gucci Mane's one year anniversary since being released from prison.  The entire album is produced by Metro Boomin, along with extra production from Southside, London on da Track, DJ Spinz and Cubeatz.  It features guest appearances from American rappers Offset, 2 Chainz, Young Dolph and Rick Ross. You Should Be Here is the second and debut commercial mixtape by American singer and songwriter Kehlani.  It was self-released through the iTunes Store on April 28, 2015.  "You Should Be Here" features guest appearances from Lexii Alijai, Chance the Rapper, and BJ the Chicago Kid.  It peaked at number 36 on the US "Billboard" 200.  Mixed by Joe Fitzgerald, the mixtape predominately features production by Jahaan Sweet, along with production from JMike, Madmax, Geoffro Cause and Ted Digtl, among others. Trap House III is a commercial mixtape by American rapper Gucci Mane.  The project serves as a sequel to his fourth album "Back to the Trap House" (2007).  The album was released exclusively to digital download retailers on May 21, 2013 independently by 1017 Brick Squad Records and 101 Distribution.  The project features guest appearances from Rick Ross, Rich Homie Quan, Wiz Khalifa, Shawty Lo, Young Scooter, Young Thug and Chief Keef among others. Kehlani Ashley Parrish (born April 24, 1995) is an American singer-songwriter and a dancer, signed to Atlantic Records.  Kehlani was originally from Oakland, California, where she achieved initial fame as a member of the teen pop group Poplyfe.  In 2014, she released her first commercial mixtape, "Cloud 19".  The mixtape was listed as one of the among of "Complex"' s "50 Best Albums of 2014."  In 2015, Kehlani released her second commercial mixtape, "You Should Be Here".  The mixtape debuted at number 5 on the national R&B/Hip-Hop chart, preceded from her sold-out North American promotional tour.  In 2016, she was nominated for the Best Urban Contemporary Album Grammy Award for "You Should Be Here".  Kehlani released her first major-label debut album, "SweetSexySavage" on January 27, 2017. Summer Songs 2 is the second commercial mixtape by American rapper Lil Yachty.  It was released on July 20, 2016, exclusively on Apple Music, with other streaming services following the release.  The mixtape features guest appearances from TheGoodPerry, G Herbo, JBans2Turnt, Byou, Big Brutha Chubba, Offset, Tyler Royale, Ksupreme and Cook Laflare, among others.  The production from the mixtape was handled by TheGoodPerry, Wizard Beatz, D33J, Misogi, ILoveUPeter, Chris Fresh, Khalil Byous, Earl, 1Mind, Sage and Free School. Woptober (stylized as "WOPTOBER") is a commercial mixtape by American rapper Gucci Mane.  It was released on October 14, 2016, by Atlantic Records and 1017 Records.  The album features guest appearances from Rick Ross and Young Dolph, as well as the production that was provided by London on da Track, Honorable C.N.O.T.E., Zaytoven, Will-A-Fool, Southside, Metro Boomin and Drumma Boy, among others. Happy Birthday is the fourth mixtape released by British rapper Tinie Tempah.  The mixtape was released for free download on December 16, 2011 on Disturbing London Records - featuring production from 3Mindz, S-X, Wizzy Wow and Stargate.  The mixtape title is "Happy Birthday" because the mixtape came into production around Tempah's 23rd birthday (November 7).  Tracks "Like It or Love It", "Lucky Cunt" and "Till I'm Gone (Remix)" were leaked prior to the mixtape release to create buzz, with "Like It or Love It" receiving minor radio airplay.  "Happy Birthday" features British rappers Chipmunk, Giggs, Wretch 32, G-Frsh, Tinchy Stryder and Krept and Konan, including a variety of American rappers; Soulja Boy, J. Cole and Big Sean, along with Wiz Khalifa, Pusha T and Jim Jones on the "Till I'm Gone" remix (originally released on August 29, 2011).  British vocalist J. Warner also makes a guest appearance. Keith Cozart (born August 15, 1995), better known by his stage name Chief Keef, is an American rapper and record producer from Chicago, Illinois.  During his teenage years and while under house arrest, Keef's music videos were met with acclaim from local high school students.  His increasing popularity led to him being the subject of a brief bidding war among labels.  Ultimately, Keef signed a major record deal with Interscope Records and later signed with 1017 Brick Squad.  Keef also became the CEO of his own record label, Glory Boyz Entertainment, which later developed into Glo Gang. Trap House 4 is a commercial mixtape American rapper Gucci Mane.  The project serves as a sequel to "Trap House III" (2013).  The project was released on July 4, 2014, by 1017 Brick Squad Records and 101 Distribution.  The project features guest appearances from Chief Keef, K Camp, Young Scooter and Fredo Santana.  The project features production from Zaytoven, Drumma Boy, Mike WiLL Made-It, Southside, Kevin McCall, C4, Tarentino, Young Chop and Bankroll Clay, among others. Nav (stylized as NAV) is the eponymous debut commercial mixtape by Canadian hip hop recording artist Nav.  It was released on February 24, 2017.  The mixtape features a guest appearance from Canadian singer and label-mate The Weeknd.  Nav handled most of the production himself, with some tracks featuring co-production from other record producers such as Metro Boomin, Rex Kudo, and DannyBoyStyles.
Answer: Trap House III