Explanation
The goal with any cloud-hosting setup is for the cloud customer to be able to perform most or all its functions for service provisioning and configuration without any need for support from or interaction with the cloud provider beyond the automated tools provided. To fulfill the tenants of on-demand self-service, required interaction with the cloud provider--either half time, full time, or a commensurate amount of time based on the contract--would be in opposition to a cloud's intended use. As such, these answers are incorrect.

Explanation
iSCSI is a protocol that allows for the transmission and use of SCSI commands and features over a TCP-based network. iSCSI allows systems to use block-level storage that looks and behaves as a SAN would with physical servers, but to leverage the TCP network within a virtualized environment and cloud.

Explanation
Within IaaS, where the cloud customer is responsible for everything beyond the physical network, the number of users on a system would not be a factor in billing or service charges. The core cloud services for IaaS are based on the memory, storage, and CPU requirements of the cloud customer. Because the cloud customer with IaaS is responsible for its own images and deployments, these components comprise the basis of its cloud provisioning and measured services billing.

In order to obtain and comply with certifications, independent external audits must be performed and satisfied. Although some testing of certification controls can be part of an internal audit, they will not satisfy requirements.

Penetration testing involves using the same strategies and toolsets that hackers would use against a system to discovery potential vulnerabilities. Although the term malicious captures much of the intent of penetration testing from the perspective of an attacker, it is not the best answer. Static and dynamic are two types of system testing--where static is done offline and with knowledge of the system, and dynamic is done on a live system without any previous knowledge is associated--but neither describes the type of testing being asked for in the question.