对于 enum Role { Admin = "ADMIN" }，哪个赋值无需断言即可通过类型检查？

对于 enum Role { Admin = "ADMIN" }，哪个赋值无需断言即可通过类型检查？

1. const role: Role = Role.Admin;
2. const role: Role = "ADMIN";
3. const role: Role = "Admin";
4. const role: Role = Object.keys(Role)[0];