Which studio developed and published a series of Doty 2 games?

Riot Games
Valve
EA
Rockstare Games
Dota 2 is a free-to-play multiplayer online battle arena (MOBA) video game developed and published by Valve Corporation. The game is the stand-alone sequel to Defense of the Ancients (DotA), which was a community-created mod for Blizzard Entertainment's Warcraft III:
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Riot Games
Valve
EA
Rockstare Games
answers
flagUnknown
16%
64%
9%
8%
145
flagPoland
18%
61%
8%
10%
1353
flagthe United Kingdom
20%
60%
13%
6%
15