Question: Which of the following is a member of the South Korean boy group VIXX: Ken or Dickie Peterson?

full_context: Document 1: Dickie Peterson: Richard Allan Peterson (September 12, 1946 – October 12, 2009) was an American musician, best known as the bassist and lead singer for Blue Cheer. He also recorded two solo albums: "Child of the Darkness" and "Tramp".
Document 2: Peter Cetera: Peter Paul Cetera ( ; born September 13, 1944) is an American singer, songwriter, and bassist best known for being an original member of the rock band Chicago (1967–1985), before launching a successful solo career. His career as a recording artist encompasses seventeen albums with Chicago and eight solo albums.
Document 3: Eric Peterson (musician): Eric Peterson (born May 14, 1964) is an American guitarist. He is best known as the only constant member of the US thrash metal band Testament. Peterson has also formed a side project black metal band called Dragonlord, in which he plays guitar and also sings. In Testament, Peterson was originally a rhythm guitarist while Alex Skolnick handled all lead work. More recently though, Peterson plays leads along with Skolnick.
Document 4: Rain (entertainer): Jung Ji-hoon (, born June 25, 1982), better known by his stage name Rain (Korean 비 IPA ['piː]), is a South Korean singer-songwriter, actor, and music producer.
Document 5: Ken (singer): Lee Jae-hwan (Hangul: 이재환 born April 6, 1992), better known by his stage name Ken (Hangul: 켄 ), is a South Korean singer and actor, signed under Jellyfish Entertainment. He is one of the members in the South Korean boy group VIXX and has been widely praised for his unique, soulful, and husky vocal tone. Ken began his acting career in 2014 in MBC Every 1's comedy drama "Boarding House No. 24" as Lee Jaehwan.
Document 6: Pete Loeffler: Pete Loeffler (born October 19, 1976) is a musician, known for his work with the Chicago-area rock band Chevelle, for which he is the lead vocalist and sole guitar player.
Document 7: N (singer): Cha Hak-yeon (Hangul: 차학연 , born June 30, 1990), better known by his stage name N (Hangul: 엔 ), is a South Korean singer, actor, presenter, and radio host, signed under Jellyfish Entertainment. Debuted as a member of the South Korean boy group VIXX in May 2012, he began his acting career in 2014 in MBC's romantic-melodrama "Hotel King" as Noah. He has since had roles in "The Family is Coming" (2015), "Cheer Up!" (2015) and "Tomorrow Boy" (2016). N began his career as a radio host in May 2015 with his show "VIXX N K-pop" on SBS Power FM.
Document 8: Dave Peters: Dave Peters is an American musician. He was the original guitarist for the band Eighteen Visions, guitarist for the band Throwdown, and, as of 2002, the vocalist for Throwdown. He did guest vocals for the song "Unleash" by groove metal band Soulfly, for the song "Feel as Though You Could" by Demon Hunter, and the song "Despair" for Living Sacrifice. He is straight edge.
Document 9: Pete Best: Randolph Peter "Pete" Best (born Randolph Peter Scanland, 24 November 1941) is an English musician, principally known as an original member and first drummer of the Beatles, from 1960 to 1962. He has been referred to as the Fifth Beatle.
Document 10: The Beast Is Back: The Beast Is Back is the seventh album by a newly reformed Blue Cheer, 13 years after their previous album, "Oh! Pleasant Hope" (1971). It contains re-recorded versions of some of the band's most popular songs from their late-1960s heyday as well as new material. The album features founding members Dickie Peterson and Paul Whaley. Original guitarist Leigh Stephens did not participate in the reunion.
Document 11: N (singer): Cha Hak-yeon (Hangul: 차학연 , born June 30, 1990), better known by his stage name N (Hangul: 엔 ), is a South Korean singer, actor, presenter, and radio host, signed under Jellyfish Entertainment. Debuted as a member of the South Korean boy group VIXX in May 2012, he began his acting career in 2014 in MBC's romantic-melodrama "Hotel King" as Noah. He has since had roles in "The Family is Coming" (2015), "Cheer Up!" (2015) and "Tomorrow Boy" (2016). N began his career as a radio host in May 2015 with his show "VIXX N K-pop" on SBS Power FM.
Document 12: Leo (singer): Jung Taek-woon (Hangul: 정택운 , born on November 10, 1990), better known by his stage name Leo (Hangul: 레오 ), is a South Korean singer, songwriter and musical theatre actor, signed under Jellyfish Entertainment. Known for his high-pitched, sharp, and clear vocals, Leo debuted as a member of the South Korean boy group VIXX in May 2012, and began his acting career in 2014 in the musical "Full House" as Lee Young-jae. In 2015 he began his songwriting career, and with VIXX member Ravi formed VIXX's first official sub-unit VIXX LR.
Document 13: Jun. K: Kim Min-jun (; born January 15, 1988), better known by his stage name Jun. K, is a South Korean singer, songwriter, record producer, rapper, dancer and actor. He is the main vocalist of 2PM.
Document 14: JB (South Korean singer): Lim Jae-beom (Hangul: 임재범; born January 6, 1994) commonly known by his stage name JB (Hangul: 제이비), is a South Korean singer, songwriter and actor. He is a member of South Korean boyband Got7, and part of the duo JJ Project. JB made his small-screen debut through the drama series "Dream High 2" in 2012. He has also starred in MBC's "When a Man Falls in Love" as Seo-Min Joon.
Document 15: Oh! Pleasant Hope: Oh! Pleasant Hope is the sixth, and last, album by Blue Cheer until 1983's "The Beast Is Back". It features less psychedelia and hard rock and includes more folk rock elements. This is an unusual Blue Cheer album in that Dickie Peterson only sings lead on three songs. Another unusual aspect is that the song "I'm the Light" features extensive use of the sitar and synthesizer, although on the previous album "The Original Human Being" the song "Babaji (Twilight Raga)" also featured extensive use of the aforementioned instruments.
ground_truth: Ken