A Private cloud. The cloud infrastructure is provisioned for exclusive use by a single organization comprising multiple consumers (e.g., business units). It may be owned, managed, and operated by the organization, a third party, or some combination of them, and it may exist on or off premises.
Other Cloud Deployment Models are:
Community cloud.
The cloud infrastructure is provisioned for exclusive use by a specific community of consumers from organizations that have shared concerns (e.g., mission, security requirements, policy, and compliance considerations). It may be owned, managed, and operated by one or more of the organizations in the community, a third party, or some combination of them, and it may exist on or off premises.
Public cloud.
The cloud infrastructure is provisioned for open use by the general public. It may be owned, managed, and operated by a business, academic, or government organization, or some combination of them. It exists on the premises of the cloud provider.
Hybrid cloud.
The cloud infrastructure is a composition of two or more distinct cloud infrastructures
(private, community, or public) that remain unique entities, but are bound together by standardized or proprietary technology that enables data and application portability (e.g., cloud bursting for load balancing between clouds).
The following reference(s) were/was used to create this question:
NIST Special Publication 800-145 The NIST definition of Cloud Computing and also see
NIST Special Publication 800-146 The Cloud Computing Synopsis and Recommendations

The simple integrity axiom of the Biba access control model states that a subject at one level of integrity is not permitted to observe an object of a lower integrity (no read down).
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the
Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 5: Security
Architectures and Models (page 205).

Explanation/Reference:
Explanation:
By leaving the laptop, which contains unique data, unguarded, you cannot guarantee that the data on it remain untampered. This breaks the chain of custody.
When evidence is seized, it is important to make sure a proper chain of custody is maintained to ensure any data collected can later be properly and accurately represented in case it needs to be used for later events such as criminal proceedings or a successful prosecution.
Incorrect Answers:
B: Locking the desktop to the desktop would not protect the data on it from being changed.
C: It is a good idea to make a disk image of the Laptop, but the critical step here is to ensure that the laptop is preserved. By leaving it alone the chain of custody is broken.
D: Cracking the admin password is not vital for the forensic investigation.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 248

Section: Security Assessment and Testing