Question: Which streaming service was the exclusive host of Prince's 38th album "Hit n Run Phase One" when it was launched in 2015?

Context paragraphs:
Hit n Run Phase One: Hit n Run Phase One is the thirty-eighth studio album by American recording artist Prince.  It was first released exclusively on the Tidal streaming service on September 7, 2015 before being released on CD on September 15, 2015 by NPG Records.

The Slaughterhouse: The Slaughterhouse is the thirtieth studio album by American recording artist Prince.  It was released on March 29, 2004 by NPG Records.  The album was released as MP3s through his website, NPG Music Club.  The album's title comes from the first line of the song "Silicon", ""Welcome 2 the slaughterhouse"".  The tracks consist of material previously available on the same website back in 2001, although some may have rearrangements of music and/or lyrics.  "2045: Radical Man" was released on the soundtrack of Spike Lee's "Bamboozled" in 2001.  "Peace" and "The Daisy Chain" were released as limited edition CD singles during Prince's 2001 Hit n Run Tour.

Hit n Run Phase Two: Hit n Run Phase Two is the thirty-ninth and final studio album by American recording artist Prince and the last to be released before his death on April 21, 2016.  It was initially released exclusively on the Tidal streaming service on December 12, 2015 for streaming and purchase as a continuation of his previous album, "Hit n Run Phase One".

The New Power Generation: The New Power Generation, also known as The NPG, was the backing band of musician Prince.  They were last active in 2013 before Prince made a return to music with 3rdeyegirl as his backing band.  In 2015, the New Power Generation reunited as Prince's backing band for his final studio album before his death, "Hit n Run Phase Two".

Tidal (service): Tidal (stylized as TIDAL) is a subscription-based music streaming service that combines lossless audio and high-definition music videos with exclusive content and special features on music.  The service is maintained by the Norwegian company Aspiro AB.  Included in Tidal's offerings are concert livestreams, ticket giveaways and other experiential events like listening parties and meet-and-greets with artists.

Niyoki: Kedrah Niyoki White (born November 15, 1973 as Kedrah Niyoki White), who goes by the stage name Niyoki, is an American gospel musician.  Her first album, "My Everything", was released by Executive Music Group alongside Dedicated 2 God Records in 2006.  This album was a "Billboard" magazine breakthrough release upon the Gospel Albums chart.  The subsequent album, "Rest", was released in 2008 by those same two labels, and it charted on the aforementioned chart.  She was a part of the girl group, Milenia, that got the chance to tour with Prince on the Hit n Run Tour in 2000 and 2001 before releasing their only album in 2006.

Parade Tour: The Parade Tour (also called the Under the Cherry Moon Tour ) was a concert tour in support of Prince and The Revolution's eighth studio album "Parade" and his 1986 film "Under the Cherry Moon".  The Hit n Run Tour wasn't a full scale American tour, but a string of concerts that was dubbed "Hit n Run" by Prince's manager.  Most of those shows were announced days or hours before the actual concert took place.  The Parade Tour marked the first full tour of Europe by Prince.  It also saw the expanded Revolution line-up and featured Sheila E. and her band as an opening act for most shows.

A Celebration (Prince Tour): Prince: A Celebration was a short American tour by Prince.  The tour used the same band from the earlier Hit n Run Tour, minus the 4-girl singing group Milenia.

General History of Africa: The General History of Africa (GHA) is a two-phase project undertaken by UNESCO from 1964 to the present.  The 1964 General Conference of UNESCO, during its 13th Session, instructed the Organization to undertake this initiative after the newly independent African Member States expressed a strong desire to reclaim their cultural identity, to rectify widespread ignorance about their Continent’s history, and to break free of discriminatory prejudices.  Phase One, which began in 1964 and was completed in 1999, consisted of writing and publishing eight volumes which highlight the shared heritage of the peoples of Africa.  Phase Two, which began in 2009, focuses on the elaboration of history curricula and pedagogical materials for primary and secondary schools on the basis of the eight volumes of the GHA.  Phase Two also focuses on the promotion of the use and harmonization of the teaching of this collection in higher education institutions throughout the Continent.  Phase Two also concerns the implementation of these materials in schools in Africa and the Diaspora.  The objective of both Phase One and Phase Two of the project is to re-appropriate the interpretation and writing of African histories and to demonstrate the contribution of African cultures past and present to the history of humanity at large.

Grey (album): "Grey" is the fourth studio album by Sandy Lam, released under CBS Records in 1987.  To continue the success of her last album in February of the same year, Sandy and her producers focused on the successful elements of her last album and applied onto this album, which introduced Eurodance into Hong Kong.  Through this album, Sandy has proved herself not as a one-hit-album wonder, but a determined singer who can always create breakthrough in her albums and performance.  "Grey" was released very strategically by CBS Records.  They were named Grey Project Phase 1, 2, and 3 respectively.  Phase One showed Sandy looking directly at the audience, and the clothing and background was cream-white.  Phase One was released in vinyl, cassette tape and CD.  Phase Two showed Sandy looking at the audience at the corner of her eye, in which the background and clothing were mainly dark blue and black.  Phase Two was released only in vinyl and cassette tapes.  In Phase Three, Sandy showed no demand from the audience.  She was in stark black and white.  Like Phase Two, Phase Three was only released in vinyl and cassette tapes.  Phase Three was a 12 inch remix of "Grey" and "Family Man".

Supporting paragraphs: Hit n Run Phase One Tidal (service)
Answer: Tidal