After three hundred years of conflict and disunity, China was reunified in $589$ by the Sui, who were soon followed by the Tang. Many of the most important innovations made during the Tang empire took place under the Emperor Taizong. Which of the following developments took place during his reign? Check all that apply.

Select $3$ correct answer$($s$)$

Combining the chakravartin ideal with Confucian policies

Reserving top government posts for those who passed written examinations

Supporting a Buddhist monastery in every province of the empire

Forbidding the slaughter of animals

Creating the Tang code