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Fault tolerance is the ability of a system to continue to function in the event of a failure of some of its  components.  In this question, you could have servers that are replicated across datacenters.    Availability zones expand the level of control you have to maintain the availability of the applications and data on your VMs. Availability Zones are unique physical locations within an Azure region. Each zone is made up of one or more datacenters equipped with independent power, cooling, and networking. To ensure resiliency, there are a minimum of three separate zones in all enabled regions. The physical separation of Availability Zones within a region protects applications and data from datacenter failures.  With Availability Zones, Azure offers industry best 99.99% VM uptime SLA. By architecting your solutions to use replicated VMs in zones, you can protect your applications and data from the loss of a datacenter. If one zone is compromised, then replicated apps and data are instantly available in another zone.    References: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/manage-availability

A private cloud is hosted in your datacenter. Therefore, you cannot close your datacenter if you are using a private cloud.  A public cloud is hosted externally, for example, in Microsoft Azure. An organization that hosts its infrastructure in a public cloud can close its data center.    Public cloud is the most common deployment model. In this case, you have no local hardware to manage or keep up-to-date – everything runs on your cloud provider's hardware.  Microsoft Azure is an example of a public cloud provider.  In a private cloud, you create a cloud environment in your own datacenter and provide self-service access to compute resources to users in your organization. This offers a simulation of a public cloud to your users, but you remain completely responsible for the purchase and maintenance of the hardware and software services you provide.    Reference: https://docs.microsoft.com/en-gb/learn/modules/principles-cloud-computing/4-cloud-deployment-models

With the public cloud, you get pay-as-you-go pricing – you pay only for what you use, no CapEx costs.  With the public cloud, you have self-service management. You are responsible for the deployment and  configuration of the cloud resources such as virtual machines or web sites. The underlying hardware that  hosts the cloud resources is managed by the cloud provider.    Incorrect Answers: A: You don’t have dedicated hardware. The underlying hardware is shared so you could have multiple customers using cloud resources hosted on the same physical hardware.  B: Connections to the public cloud are secure. C: Storage is not limited. You can have as much storage as you like.  References: https://docs.microsoft.com/en-gb/learn/modules/principles-cloud-computing/4-cloud-deployment-models