Question: Which season was the runner up of the third season of American Idol on?

Knowledge 1: American Idol (season 3)
The third season of American Idol premiered on Monday, January 19, 2004 and continued until May 26, 2004. The third season was won by Fantasia Barrino, who defeated Diana DeGarmo by an approximate margin of 2% (1.3 million votes); the vote total (65 million votes) was the highest recorded vote total in the show's history until the May 23, 2007, finale of the sixth season. This season also featured Jennifer Hudson, who would subsequently win the 2006 Academy Award for Best Supporting Actress. This is the last season to be aired in standard definition, with the only exception being the grand finale. [SEP] Knowledge 2: American Idol
The performance of "Summertime" by Barrino, later known simply as "Fantasia", at Top 8 was widely praised, and Simon Cowell considered it as his favorite Idol moment in the nine seasons he was on the show. Fantasia and Diana DeGarmo were the last two finalists, and Fantasia was crowned as the winner. Fantasia released as her coronation single "I Believe", a song co-written by season one finalist Tamyra Gray, and DeGarmo released "Dreams". Fantasia went on to gain some successes as a recording artist, while Hudson, who placed seventh, became the only Idol contestant so far to win both an Academy Award and a Grammy.
Knowledge 1: American Idol (season 3)
The third season of American Idol premiered on Monday, January 19, 2004 and continued until May 26, 2004. The third season was won by Fantasia Barrino, who defeated Diana DeGarmo by an approximate margin of 2% (1.3 million votes); the vote total (65 million votes) was the highest recorded vote total in the show's history until the May 23, 2007, finale of the sixth season. This season also featured Jennifer Hudson, who would subsequently win the 2006 Academy Award for Best Supporting Actress. [SEP] Knowledge 2: American Idol
The performance of "Summertime" by Barrino, later known simply as "Fantasia", at Top 8 was widely praised, and Simon Cowell considered it as his favorite Idol moment in the nine seasons he was on the show. Fantasia and Diana DeGarmo were the last two finalists, and Fantasia was crowned as the winner. Fantasia released as her coronation single "I Believe", a song co-written by season one finalist Tamyra Gray, and DeGarmo released "Dreams". Fantasia went on to gain some successes as a recording artist, while Hudson, who placed seventh, became the only Idol contestant so far to win both an Academy Award and a Grammy.
Knowledge 1: American Idol (season 3)
The third season of American Idol premiered on Monday, January 19, 2004 and continued until May 26, 2004. The third season was won by Fantasia Barrino, who defeated Diana DeGarmo by an approximate margin of 2% (1.3 million votes); the vote total (65 million votes) was the highest recorded vote total in the show's history until the May 23, 2007, finale of the sixth season. This season also featured Jennifer Hudson, who would subsequently win the 2006 Academy Award for Best Supporting Actress. This is the last season to be aired in standard definition, with the only exception being the grand finale. [SEP] Knowledge 2: American Idol
Phillips became the winner, beating Sanchez. Prior to the announcement of the winner, season five finalist Ace Young proposed marriage to season three runner-up Diana DeGarmo on stage – which she accepted.

Answer: season three