Comprehensive and Detailed Explanation From Exact Extract:

Multifactor authentication (MFA) is considered one of the most effective security measures for cloud environments. It requires users to verify their identity using two or more factors (e.g., password + phone app code), making it significantly harder for external attackers to gain access, even if the primary password is compromised.

B. Encryption is important for data protection but doesn’t prevent unauthorized logins.

C. Backups protect against data loss but don’t stop breaches.

D. Strong passwords are helpful but can still be phished or cracked — MFA adds a critical extra layer.