You have a Microsoft 365 subscription, and you are responsible for securing your Office 365 tenant. You want to set your users passwords to expire after 90 days. 
How should you configure this?

Answer options:

A.In Microsoft 365 admin center-> Setting -> Org settings
B.In Azure Active Directory – Password reset - Customization
C.In Azure Active Directory – Security – Security Center
D.In cloud shell - Get-AzureADUser -All $true | Set-AzureADUser -PasswordPolicies DisablePasswordExpiration

Correct Answer: A 
You should navigate to Microsoft 365 admin center, Settings, Org settings, Security & Privacy and select Password expiration policy 

Set the “Days before passwords expire” to 90 days. 

Option B is incorrect. This is where you customize a helpdesk link
Option C is incorrect. Azure security center is a hub for administering security status and threat protection.
Option D is incorrect. This command removed password expiration.
Reference: 
To know more about configuring org wide password policy, please refer to the link below: 

https://docs.microsoft.com/en-us/microsoft-365/admin/manage/set-password-expiration-policy?view=o365-worldwide