Question: The network that airs the comedy series "30 Rock" is a subsidiary of what company?

Context paragraphs:
Klaus and Greta: "Klaus and Greta" is the ninth episode of the fourth season of the American television comedy series "30 Rock".  It was written by co-showrunner and executive producer Robert Carlock and directed by Gail Mancuso.  The episode originally aired on the National Broadcasting Company (NBC) network in the United States on January 14, 2010.  Guest stars in this episode include James Franco, Matt Lauer, and Jeffery Self.  "Klaus and Greta" aired out of its usual timeslot with "Black Light Attack! " following it in the regular timeslot.

30 Rock: A XXX Parody: 30 Rock: A XXX Parody is an American pornographic film released on August 24, 2009 that parodies the television comedy series "30 Rock".  The film was directed by Lee Roy Myers and produced by the company New Sensations, who had also created parodies such as "Scrubs: A XXX Parody" and "".  Lisa Ann, who parodied Sarah Palin in "Who's Nailin' Paylin? ", stars as Liz Lemon the character originally played by Tina Fey, who parodied Palin herself on "Saturday Night Live".

List of 30 Rock characters: "30 Rock" is an American television comedy series created by Tina Fey, which aired on NBC.  The series takes place behind the scenes of a fictional live sketch comedy series, also airing on NBC; the name "30 Rock" refers to the address of the GE Building, where NBC Studios is located (30 Rockefeller Plaza).  The series has an ensemble cast consisting of 14 regular cast members: Tina Fey, Alec Baldwin, Tracy Morgan, Jane Krakowski, Jack McBrayer, Scott Adsit, Judah Friedlander, Katrina Bowden, Keith Powell, Lonny Ross, John Lutz, Kevin Brown, Grizz Chapman, and Maulik Pancholy.

30 Rock (season 6): The sixth season of "30 Rock", an American television comedy series on the NBC network in the United States, began airing on January 12, 2012.  "30 Rock" was renewed for a sixth season by NBC on November 15, 2010.  The season began airing mid-season to accommodate Tina Fey's pregnancy.  On November 14, 2011, NBC announced that "30 Rock" would return at the new time of 8:00 pm.

Matt Hubbard: Matt Hubbard is an American television writer and screenwriter who has worked on many television shows.  He graduated from Beverly High School, in Beverly, Massachusetts in the class of 1996, where he excelled in the English Department.  He later went on to attend Harvard University where he was an editor for the Harvard Lampoon.  He has worked as a writer on the NBC comedy series "30 Rock".  He won Emmy awards in 2009 for both Outstanding Writing for a Comedy Series, for his 30 Rock episode "Reunion," and for Outstanding Comedy Series.  He worked as a Consulting Producer on the last two seasons of "Parks and Recreation".

NBC: The National Broadcasting Company (NBC) is an American English language commercial broadcast television network that is a flagship property of NBCUniversal, a subsidiary of Comcast.  The network is headquartered at 30 Rockefeller Plaza in New York City, with additional major offices near Los Angeles (at 10 Universal City Plaza), and Chicago (at the NBC Tower).  The network is part of the Big Three television networks.  NBC is sometimes referred to as the "Peacock Network", in reference to its stylized peacock logo, introduced in 1956 to promote the company's innovations in early color broadcasting.  It became the network's official emblem in 1979.

30 Rock (season 7): The seventh and final season of "30 Rock", an American television comedy series on the NBC network in the United States, began airing on October 4, 2012.  "30 Rock" was renewed for a seventh and final season of 13 episodes on May 10, 2012, to air on Thursdays at 8:00 pm.  The hour-long series finale wrapped filming on December 19, 2012, and aired on January 31, 2013.

Argus (30 Rock): "Argus" is the nineteenth episode of the fourth season of the American television comedy series "30 Rock", and the 77th overall episode of the series.  It was written by "30 Rock" producers Dylan Morgan, Paula Pell, and Josh Siegal.  The episode was directed by co-executive producer and show composer Jeff Richmond.  It originally aired on the National Broadcasting Company (NBC) network in the United States on April 29, 2010.  Guest stars in this episode include Will Forte, Marceline Hugot, and Burke Moses.

30 Rock (season 5): The fifth season of "30 Rock", an American television comedy series on the NBC network in the United States, began airing on September 23, 2010.  NBC announced on March 5, 2010 that "30 Rock" would be returning for a fifth season in the 2010–2011 television season.  Beginning with episode 11, "30 Rock" was moved to the 10:00 PM timeslot, but, as a consolation, was renewed earlier than the other NBC sitcoms.  During this time, Tracy Morgan underwent an emergency operation, causing his character to be written out for several episodes.

Live from Studio 6H: "Live from Studio 6H" is the of the sixth season of the American television comedy series "30 Rock", and the 122nd episode overall.  It features a return to live broadcasting from the season five episode "Live Show", both of which were directed by Beth McCarthy-Miller, and co-written by series creator Tina Fey.  The episode originally aired live on the NBC television network in the United States on April 26, 2012, with separate tapings for the East Coast and West Coast audiences.  "Live from Studio 6H" featured guest appearances by comedian Amy Poehler, musician Paul McCartney, and several actors associated with "30 Rock" and "Saturday Night Live".

Supporting paragraphs: Klaus and Greta NBC
Answer: Comcast