A company asked you to help mitigate the brute force attacks carried out against its users' Windows account passwords. You successfully removed the malware responsible for the attacks and need to better secure the passwords assigned to the user accounts without limiting the system's usability.

What options can be included when securing user accounts? $($Select THREE.$)$

a$.$

Require strong passwords.

b$.$

Set failed logon restrictions.

c$.$

Disable password complexity requirements.

d$.$

Require user account passwords.

e$.$

Change each account type to Administrator.

f$.$

Add each user to the Guests group.