A CSP contracts for a penetration test to be conducted on its infrastructures. The auditor engages the target with no prior knowledge of its defenses, assets, or channels. The CSP’s security operation center is not notified in advance of the scope of the audit and the test vectors. Which mode is selected by the CSP?

A. Double gray box

B. Tandem

C. Reversal

D. Double blind

Reference: https://business-iq.net/articles/4327-EN-these-are-the-different-types-of-penetration-testing