Passage: Officially, Kim Jong-un is part of a triumvirate heading the executive branch of the North Korean government along with Premier Kim Jae-ryong (no relation) and parliament president Choe Ryong-hae. Each nominally holds powers equivalent to a third of a president's powers in most presidential systems. Kim Jong-un commands the armed forces, Kim Jae-ryong heads the government and handles domestic affairs, and Choe Ryong-hae handles foreign relations. Nevertheless, it is generally understood that Kim Jong-un, like his father and grandfather before him, exercises absolute control over the government and the country.  Indeed, a constitutional amendment enacted by his father explicitly named the NDC (first) chairman as "the supreme leader of the Democratic People's Republic of North Korea".On 30 November 2012, Kim met with Li Jianguo, who "briefed Kim on the 18th National Congress of the Communist Party of China", according to the state's official news agency, the Korean Central News Agency. A letter from Xi Jinping, General Secretary of the Communist Party of China, was hand-delivered during the discussion.On 9 March 2014, Kim Jong-un was elected to a seat in the Supreme People's Assembly, the country's unicameral legislature. He ran unopposed, but voters had the choice of voting yes or no. There was a record turnout of voters and, according to government officials, all voted "yes" in his home district of Mount Paekdu. The Supreme People's Assembly subsequently elected him first chairman of the National Defense Commission.

Question: Who was in charge of electing the first chairman?
The Supreme People's Assembly