Question: What is the counterpart of the conference that the Arizona Cardinals belong to?

Context paragraphs:
Leonard Davis (American football): Leonard Barnett Davis (born September 5, 1978) is an American former college and professional football player who was an offensive lineman for twelve seasons in the National Football League (NFL).  He played college football for the University of Texas, and was recognized as a consensus All-American.  Davis was drafted by the Arizona Cardinals with the second pick overall of the 2001 NFL Draft, and also played professionally for the Arizona Cardinals, Dallas Cowboys, Detroit Lions and San Francisco 49ers of the NFL.

Arizona Cardinals Cheerleaders: The Arizona Cardinals Cheerleaders is the official cheerleading group of the Arizona Cardinals.  The group performs at University of Phoenix Stadium, the home stadium of the Cardinals.

2003 San Diego Chargers season: The 2003 San Diego Chargers season began with the team trying to improve on their 8–8 record in 2002.  They finished the campaign last in their division with only four wins and earned the #1 pick in the 2004 NFL draft.  They played one “home” game during the season, against the Miami Dolphins, at Sun Devil Stadium in Tempe, Arizona where the Arizona Cardinals played, due to the Cedar Fire.  The team declined from the previous season, as the Chargers won four games and surrendered the second most points per game (27.6), trailing only the Arizona Cardinals during the season.

1998 Arizona Cardinals season: The 1998 Arizona Cardinals season was the franchise's 79th in the National Football League.  It was the Cardinals' 11th season in Arizona.  The club posted its first winning record since 1984, appeared in the postseason for the first time since 1982, its first postseason appearance in a non-strike season since 1975, and won its first postseason game since 1947.  It was the Cardinals' first playoff appearance in its tenure in Arizona.  Arizona ended up losing to the Minnesota Vikings, who won 15 games, 41–21 in the Divisional round.  Over the next 10 years, the Cardinals fell out of contention.  They returned to the playoffs following the 2008 season, including a Super Bowl appearance despite a mediocre 9–7 record.

National Football Conference: The National Football Conference (NFC) is one of the two conferences of the National Football League (NFL), the highest professional level of American football in the United States.  This conference and its counterpart, the American Football Conference (AFC), currently contain 16 teams each, making up the 32 teams of the NFL.  Both conferences were created as part of the 1970 merger with the rival American Football League (AFL), with all ten of the former AFL teams and three NFL teams forming the AFC while the remaining thirteen NFL clubs formed the NFC.  A series of league expansions and division realignments have occurred since the merger, thus making the current total 16 clubs per conference.

Arizona Cardinals: The Arizona Cardinals are a professional American football franchise based in the Phoenix metropolitan area.  The Cardinals compete in the National Football League (NFL) as a member of the league's National Football Conference (NFC) West division.  The Cardinals were founded as the Morgan Athletic Club in 1898, and are the oldest continuously run professional football team in the United States.  The Cardinals play their home games at the University of Phoenix Stadium, which is located in the northwestern suburb of Glendale, Arizona.

Quentin Harris (American football): Quentin Hugh Harris (born January 26, 1977) is a former American football safety who last played for the Denver Broncos of the National Football League.  Harris also played for the Arizona Cardinals.  He is currently a scout for the Arizona Cardinals.

1994 Arizona Cardinals season: The 1994 Arizona Cardinals season was the team's 75th season with the National Football League, the seventh season in Arizona and the first season as the Arizona Cardinals.  Buddy Ryan became the 32nd head coach in Cardinals history.  After being given a large share of the credit for the success of the Houston Oilers in 1993, Ryan was named head coach of the Arizona Cardinals in 1994.  Also named general manager of the Cardinals, Ryan went 8–8 his first year, the Cardinals' first non-losing season since 1984.

Eric Mensik: Eric Mensik (born December 18, 1987) is a former American football offensive tackle.  He was signed by the Arizona Cardinals as an undrafted free agent in 2011.  He played college football at Oklahoma from 2007 to 2010, beginning as a tight end and later moving to the offensive line.  He was selected as a first-team All-Big 12 player after the 2010 college football season.  Mensik was signed by the Arizona Cardinals as an undrafted free agent following the end of the NFL lockout in 2011.  He was waived on August 29, 2011.

Robert Nkemdiche: Robert Nkemdiche ( ; born September 19, 1994) is an American football defensive end for the Arizona Cardinals of the National Football League (NFL).  He attended the University of Mississippi for three years until declaring early for the 2016 NFL Draft where he was picked 29th overall by the Arizona Cardinals.

Supporting paragraphs: Arizona Cardinals National Football Conference
Answer: American Football Conference