Why would the public cloud provider disagree with these terms?

An organization is using a public cloud provider for IaaS instances. The organization has developed and deployed a web application within these instances.

The organization wishes to formalize an SLA that specifies that the public cloud provider will:

• Respond to infrastructure outages within 4 hours

• Offer multiple availability zones

• Ensure application up-time of 99.9%

• Provide monthly billing reports

Why would the public cloud provider disagree with these terms?
A . IaaS instances are virtual and therefore do not require a monthly bill.
B . Availability zones must span multiple cloud providers.
C . Application up-time is not the responsibility of other cloud provider.
D . Infrastructure outages are not the responsibility of the cloud provider.