Question: Which American rapper co-wrote a song featured on the album unfold?
Context: "Planes" (later stylized as "Planez" to avoid a lawsuit) is a song by American singer Jeremih from his third studio album, "Late Nights".  It features American rapper J. Cole, and was released as the second single from the album.  The original version of the song featured a verse from fellow Chicago native Chance The Rapper.  The single garnered Jeremih's first career Grammy nomination for Best R&B Performance at the 58th Annual Grammy Awards which was held in February 2016. "Hey Ma" is the second single released from American rapper Cam'ron's third album "Come Home with Me".  The song featured Juelz Santana, Freekey Zekey and Toya, and was produced by the Tuneheadz, who used a sample of The Commodores' 1977 hit, "Easy". "Victory" is a song recorded by American hip hop recording artist Puff Daddy.  The song was originally written by The Notorious B.I.G., Jason Phillips and Steven Jordan for his debut studio album "No Way Out" (1997).  It features heavy use of mafioso-style lyrics, as was popular at the time.  It features The Notorious B.I.G., who raps two verses, and Busta Rhymes, who raps the song's chorus.  The song also heavily sampled the Bill Conti song "Going the Distance", which featured on the soundtrack to the movie "Rocky" making it a darker start to a rap album that featured many (at the time) club-standard singles.  The song was released as a single in 1998, peaking at number 19 on the "Billboard" Hot 100.  This song featured the very last verses recorded by The Notorious B.I.G. before his 1997 death as these verses were recorded a day before his shooting.  The song was used for the video game by 2K Sports, "NBA 2K13" by Puff Daddy and the Family featuring The Notorious B.I.G. and Busta Rhymes.  This was re-used for the soundtrack of NBA 2K18. Watchout!  is the fourth studio album and fifth album overall by Martha and the Vandellas, released on the Gordy (Motown) label in 1966.  The album featured the hit singles, "I'm Ready for Love" and "Jimmy Mack" and the ballad single, "What Am I Gonna Do Without Your Love?"  This was one of the last albums by the girls to feature songs from Holland, Dozier, Holland, who the following year would leave Motown, as was with William "Mickey" Stevenson, the man who helped put the group on the musical map.  The title of the album "Watchout!"  was derived from a song featured on the flip-side of their hit single "My Baby Loves Me" (released earlier in 1966) entitled "Never Leave Your Baby's Side" (never released on an album).  That song featured a chorus from the Vandellas which warned to "Watchout!"  for "other girls" who could steal your man. "I Miss My Homies" is the first single from American rapper Master P's 1997 studio album, "Ghetto D", produced by Mo B. Dick & Odell of Beats By The Pound.  The single was released a month prior to the album's unveiling.  The song featured Silkk the Shocker, O'Dell, Sons of Funk, Mo B. Dick, Pimp C, and Mercedes. "It's Only Christmas" is a song by Irish pop singer and Boyzone frontman Ronan Keating, released as the second single from his sixth studio album, "Winter Songs", exclusively in Australia and New Zealand.  The version of the song featured on the British version of "Winter Songs" features vocals from Hayley Westenra, however, the version of the song featured on the Australian version of the album replaces her vocals with those of Kate Ceberano, and thus, whose vocals appear on the single.  Although not an international hit like his previous singles, Keating's version of the song failed to make the Top 100 of the Australian Singles Chart, peaking at #134 after one week on the chart. Unfold is the debut solo album by singer/songwriter Marié Digby.  The album features the singles "Umbrella" (a cover of the Rihanna hit), "Say It Again" and "Stupid for You", and was released on April 8, 2008 in the United States via Hollywood Records.  The album debuted at #29 on the Billboard 200 with 18,000 copies sold in its first week. American rapper Nicki Minaj has recorded songs for three studio albums, one re-issue and three mixtapes, some of which were collaborations with other performers.  Her debut album, "Pink Friday", was released in November 2010. " Your Love" was released as the lead single; it contains a sample of British singer-songwriter Annie Lennox's song "No More I Love You's".  Minaj wrote the songs "Roman's Revenge" (which features American rapper Eminem) and "Here I Am" in collaboration with producer Swizz Beatz.  "Roman's Revenge" references both artists' alter-egos, Roman Zolanski for Minaj and Slim Shady for Eminem.  She co-wrote the song "Did It On'em" with Grammy Award-winning American producer Bangladesh, alongside Justin Ellington and Safaree Lloyd Samuels.  Minaj and J. R. Rotem worked together on the seventh and eighth single releases "Girls Fall Like Dominoes" and "Fly", which features Bajan recording artist Rihanna.  On "Girls Fall Like Dominoes", Minaj raps about how she can steal fans from male artists in the music industry, specifically Lil Wayne and Drake.  Rihanna's contribution to the "inspirational" ballad "Fly" was added at Minaj's request, as noted by Jayson Rodriquez writing for MTV News.  Andrew "Pop" Wansel and Warren "Oak" Felder co-wrote three tracks with Minaj, including "Your Love", "Save Me" and "Muny". "Umbrella" is a song by Barbadian singer Rihanna from her third studio album "Good Girl Gone Bad" (2007).  It features American rapper Jay-Z, who co-wrote the song with its producers Tricky Stewart and Kuk Harrell, with additional writing from The-Dream.  The song was originally written with Britney Spears in mind, but her label rejected it.  "Umbrella" is a pop, hip hop and R&B song referring to a romantic and platonic relationship and the strength of that relationship. "Just Ask Me To" is a song by American R&B Singer Tevin Campbell.  It was released in June 1991 as the second single from his debut album "T.E.V.I.N." It did fairly well on the R&B chart, reaching number nine, but not as much success on the pop chart, where it peaked at number 88.  The song featured rapper Chubb Rock and was also featured on the "Boyz n the Hood" soundtrack.
Answer: Jay-Z