Jack, a citizen of China, arrived in Malaysia on 4 April 2019 and left Malaysia on 8 March 2021 upon completion of his employment contract. He was in Malaysia during the period of his contract except for the following periods (assume he was outside Malaysia on both the opening and ending days: Period 20 Dec 2019-4 Jan 2020 1 May 2020 - 30 June 2020 1 Aug 2020 - 15 Aug 2020 19 Sept 2020 - 30 Dec 2020 2 Jan 2021 - 10 Jan 2021 Country US Singapore Thailand China Indonesia Remarks Business trip Business trip Social visit Business trip Medical treatment a. State, with reasons, Jack's residence status for YA2019, 2020 and 2021? b. How would your answer in a. change if the social visit to Thailand was from 1 Aug 2020 to 14 Aug 2020?