Which of the following is the BEST way to ensure data is properly sanitized while in cloud storage?

Deleting data from the file system often only removes pointers to the data, leaving the actual data blocks recoverable with specialized tools until overwritten.

Cryptographically scrambling data involves encrypting it with a strong key and then securely destroying the encryption key. This renders the underlying data irrecoverable and unreadable, effectively sanitizing it without requiring physical access to the storage media, which is typically not possible in a cloud environment.

Formatting cloud storage at the block level is usually an operation performed by the cloud provider, and even if possible, it's not a direct control for the customer to sanitize specific data objects without affecting the entire storage volume.

Degaussing is a physical destruction method using strong magnetic fields to erase data from magnetic media; this is not applicable for logical data sanitization in a multi-tenant cloud environment where users do not have access to the physical media.