According to the Model Code for Securities Transactions by Directors of Listed Issuers in Hong Kong Listing Rules, who must a director notify before trading?

ID : 1908
Long answer : A designated director must notify the chairman or a designated director before trading. (Source: https://en-rules.hkex.com.hk/sites/default/files/net_file_store/HKEX4476_3785_VER31169.pdf)
Short answer : The chairman or a designated director .
answer 2 : All employees.
answer 3 : External auditors.
answer 4 : Regulatory staff.