A. A user account was locked out.
B. A user account was disabled.
C. A user account was enabled.
D. A user account was created.
Explanation:
Reference: https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4740#:~:text=For%204740(S)%3A%20A,Security%20ID”%20is%20not%20SYSTEM.