Which of the following offerings typically allows the customer to apply operating system patches?

A.
Software as a service

B.
Public Clouds

C.
Cloud Based Storage

D.
Infrastructure as a service

Explanation:
Cloud users install operating-system images and their application software on the cloud infrastructure to
deploy their applications. In this model, the cloud user patches and maintains the operating systems and
the application software.
Incorrect Answers:
A: In the business model using software as a service (SaaS), users are provided access to application
software and databases. Cloud providers manage the infrastructure and platforms that run the
applications. SaaS is sometimes referred to as “on-demand software” and is usually priced on a pay-peruse basis or using a subscription fee.
B: A cloud is called a “public cloud” when the services are rendered over a network that is open for public
use.
C: Cloud storage is a model of data storage where the digital data is stored in logical pools, the physical
storage spans multiple servers, and the physical environment is typically owned and managed by a
hosting company.

http://en.wikipedia.org/wiki/Cloud_computing
http://en.wikipedia.org/wiki/Cloud_storage