About cloud computing, choose the most correct alternative:

Scaling is the ability of clouds to handle increases or decreases in usage demands for IT resources.

Vertical scaling is obtained by simply adding more of the same resources and it is recommended

because the new resources will be instantly available. Horizontal scaling is achieved by replacing IT

resources by more powerful ones. The latter is specially recommended when equipments in a data

centre are reaching technology obsolescence.

By working on$-$premise or on cloud environments, a company will always be able to work under the

same service$-$level agreements for quality attributes, e$.$g$.,$ usability, performance, security and

availability.

Because they use most of the same resources and technology, it is correct to say that cloud is just

another name for the Internet.

Cloud services are the IT resource that are available for remote access on cloud environments. For

each service, a SLA has to be established in order to describe features related to quality of service. A

SLA is needed because the cloud user must know what he or she is paying for.