The correct option is Overwriting data.

Overwriting data is a method you can execute remotely in a cloud environment because it works at the logical block level and does not require physical access to the underlying hardware. Overwriting writes new patterns over the storage blocks that held the sensitive records so the previous contents become unrecoverable by normal means and this is the practical approach available to tenants of public cloud platforms.

Overwriting data aligns with common cloud provider practices where logical wipes or secure erase operations are performed when disks are reprovisioned or explicitly sanitized. In many cloud architectures you can also combine overwriting with cryptographic erase by destroying encryption keys to achieve rapid and verifiable data sanitization when physical access is not possible.

Deleting Compute Engine disks and snapshots is incorrect because simple deletion typically removes logical pointers but does not guarantee that the underlying storage blocks have been overwritten. Snapshots may persist or be retained by the provider and deleted objects can remain on physical media until they are sanitized.

Physical shredding is incorrect because it requires physical access to hardware and destructive handling of media. A cloud tenant cannot perform shredding on provider hardware and the provider must handle any such physical destruction.

Degaussing magnetic media is incorrect because it also requires physical access and it is not effective for many modern storage types such as solid state drives. Degaussing is not an option a remote cloud tenant can execute to sanitize data.

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