Question: Which season's promotional posters have the stars throwing slushies at the camera in pairs?
About the article "Glee (TV series)", section "Promotion".

Candidate passages:
Prior to the second episode's premiere, "Glee"'s cast went on tour at several Hot Topic stores across the nation.
The cast sang the U.S. national anthem at the third game of the 2009 World Series.
Macy's invited them to perform at the 2009 Macy's Thanksgiving Day Parade, but host broadcaster NBC declined because "Glee" aired on a rival network.
Murphy commented on the cast's exclusion: "I completely understand NBC's position, and look forward to seeing a Jay Leno float.
"The show's success sent the cast on a concert tour, Glee Live!
In Concert!
after the first season's wrapup.
They visited Phoenix, Chicago, Los Angeles, and New York.
The cast also recorded a cover of Wham!
's "Last Christmas", which was released as a single in late 2009 but didn't appear in the show until "A Very Glee Christmas" on December 10, 2010.
Morrison, Lynch, Michele, Monteith, and Colfer reprised their roles as Will, Sue, Rachel, Finn, and Kurt respectively for a cameo appearance in an episode of "The Cleveland Show" that aired January 16, 2011.
Michele, Monteith, and Riley appeared as campers in the twenty-second season premiere of "The Simpsons".
Lynch, Colfer, Monteith, and Riley appeared at the 2010 MTV VMAs on September 12, 2010.
When Agron, Michele, and Monteith posed for a set of risqué photos for the November 2010 edition of "GQ" magazine, Parents Television Council (PTC) criticized the show; PTC president Tim Winter commented that "Glee" has many young fans, and that "by authorizing this kind of near-pornographic display, the creators of the program have established their intentions on the show’s direction.
And it isn't good for families.
"The promotional posters for the first season have the show's stars using their right hands to make an "L" to fill in the "L" of the word "Glee".
The second season's promotional posters have the stars throwing slushies at the camera in pairs.
The third season's promotional posters have the stars getting dodgeballs thrown at them by Sue Sylvester.
While the cast concert tour, Glee Live!
In Concert!, began on May 15, 2010, and presented concerts in four cities in the US that month, the second edition, with an almost-entirely new set list, toured for four weeks in the US and Canada from May 21 through June 18, 2011, and followed with twelve days in England and Ireland, from June 22 through July 3, 2011.
The cast also performed on the seventh season of "The X Factor" on December 5, 2010.
Unusual for a short film release, Lough's last five films were the subject of extensive promotional campaigns which have included trailers, posters, press interviews and articles in publications such as "SFX", "Little White Lies", "Irish Independent" and "Film Ireland" magazine. 
Two promotional posters were issued to promote the single, the most common of the pair was simply an oversized reproduction of the single's front cover. 
The standard prescribes 26-pin Miniature Delta Ribbon connectors (MDR-26) for use with Camera Link; the shrunk variant SDR-26 is allowed since standard version 1.2.
The connector pin assignments are shown in the large figure in the previous section.
The connector pinout is the following:Matching differential pairs are deliberately located at opposite sides of the connector, and at different connector sides at the different ends of the cable.
This prevents skew due to the connector being mounted perpendicularly on a PCB.
Camera Link cables are shielded twisted pair cables.
The standard specifies that differential pairs must be individually shielded, and the cable as a whole must have two shields.
Some companies save costs by not shielding the two serial interface signal pairs, which carry slower signals than the camera data; these cables have one camera end and one grabber end and may not be reversed, and cannot be used as a second cable in a Medium or Full configuration. 
 The music used in the second season's promotional advertising is an original score from Downright Music, Session 5 - Premiere Song Sampler called 'A long way to go' The music used in the third season's promotional cinema, TV and radio advertising is "Everybody's Gotta Learn Sometime" by Robyn Loau.
The music used in the fourth season's promotional advertising is 'Fighter' by Christina Aguilera.
The music used in the promotional advertising and the opening and end credits for the first five seasons of the show is 'Lift' by Shannon Noll.
The music used in the eighth season's promotional advertising is 'Try' by Pink.
The music used in the ninth season's promotional advertising is 'Roar' by Katy Perry.