Which statement BEST describes the relationship between Regions, Availability Zones and data centers?
a. Regions are clusters of Availability Zones. Availability Zones are clusters of data centers.
b. Data centers are clusters of Regions. Regions are clusters of Availability Zones.
c. Availability Zones are clusters of Regions. Regions are clusters of data centers.
d. Data centers are cluster of Availability Zones. Regions are clusters of Availability Zones.
