Your company wants to enable multi-factor authentication (MFA) for all logins but the company does not have Azure AD Premium P1 or P2 licenses. Which option does the company have to enable MFA in this case?

Answer options:

A.Azure Policies
B.Azure Blueprint
C.Conditional Access Policy
D.Azure Security Defaults

Correct Answer: D 
Conditional Access Policies can be implemented only with Azure AD Premium P1 or P2 licenses. Azure Blueprints and Azure policies have no effect on the user logins. Azure Security Defaults can be used to enforce MFA for all user logins and there is no need for an Azure AD Premium license.
Option A is incorrect. Azure policies have no effect on the user logins.
Option B is incorrect. Azure blueprints also have no effect on the user logins.
Option C is incorrect. Conditional Access Policies can be implemented only with Azure AD Premium P1 or P2 licenses.
Option D is correct. Azure Security Defaults can be used to enforce MFA for all user logins and there is no need for an Azure AD Premium license.
Reference: 
To know more about the security defaults, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/active-directory/fundamentals/concept-fundamentals-security-defaults