Auditability is the trait where organisations can collect and verify the correctness of the organisations processes and procedures.

SaaS requires least maintenance from the customer as all the infrastructure up to application is managed by the cloud service provider

Often, this type of questions looks simple, but a confusion is created and you need to be careful while picking up the right options ln our case, metered pricing and metered servicing looks similar but Metered pricing is one of the characteristics of cloud computing.

All the options given are correct methods of destroying data but when it comes to data in cloud. the most suitable method is cryptographic erasure.
Definition: Cryptographic Erasure
Cryptographic erasure is the process of using encryption software (either built-in or deployed) on the entire data storage device. and erasing the key used to decrypt the data.