Cloud service providers

Many cloud service providers deliver cloud computing:

Select one:
a.as software as a service (SaaS), platform as a service (PaaS), or infrastructure as a service (IaaS).
b.As software service (AWS), Machine learning
c.PaaS, Rocos, Noos, C2RO Cloud Robotics
d.Both A and C

The data center physical security requirements can be grouped by domains:

Select one:
a.like location threats, perimeter security, building design measures impacting security, or general access control measures
b.Robotic threats, perimeter security, building design measures impacting autonomous AI security
c.Threats, military autonomous threats, cyber threats
d.None of the above

What uses a constant amount of metadata for any number of replicas, and new replicas may be created dynamically without preprocessing the file again?

Select one:
a.MR-PDP
b.ENC-PDP scheme
c.PDP