A company is discarding a classified storage array and hires an outside vendor to complete the disposal. Which of the following should the company request from the vendor?

When disposing of classified storage arrays, a company needs assurance that the data has been securely destroyed and the disposal process followed all regulations. A "certification" from the vendor provides this formal, documented proof that the data destruction and disposal were completed according to specified standards and policies. This is crucial for compliance and liability. An "inventory list" is useful for tracking assets but doesn't confirm secure disposal. "Classification" refers to the data's sensitivity level, which the company already knows. "Proof of ownership" is irrelevant for disposal services; the company already owns the array.