A SaaS provider wants to maintain maximum availability for its service.
Which of the following should be implemented to attain the maximum SLA?

A company recently experienced a power outage that lasted 30 minutes. During this time, a whole rack of servers was inaccessible, even though the servers did not lose power.
Which of the following should be investigated FIRST?

A resource pool in a cloud tenant has 90 GB of memory and 120 cores. The cloud administrator needs to maintain a 30% buffer for resources for optimal performance of the hypervisor. Which of the following would allow for the maximum number of two-core machines with equal memory?

The human resources department was charged for a cloud service that belongs to another department. All other cloud costs seem to be correct.
Which of the following is the MOST likely cause for this error?

Which of the following strategies will mitigate the risk of a zero-day vulnerability MOST efficiently?