Explanation
With the distributed nature of cloud environments, the foremost challenge for data discovery is awareness of the location of data and keeping track of it during the constant motion of cloud storage systems.

A firewall is a technological control. The safe and extinguisher are physical controls and firing someone is an administrative control.

SOC Type 1 reports are intended for restricted use, only to be seen by the actual service organization, its current clients, or its auditors. These reports are not intended for wider or public distribution.SAS-70 audit reports have been deprecated and are no longer in use, and both the SOC Type 2 and 3 reports are designed to expand upon the SOC Type 1 reports and are for broader audiences.

Portability is the ability for a service or system to easily move among different cloud providers.
This is essential for using a cloud solution for BCDR because vendor lock-in would inhibit easily moving and setting up services in the event of a disaster, or it would necessitate a large number of configuration or component changes to implement. Interoperability, or the ability to reuse components for other services or systems, would not be an important factor for BCDR.
Reversibility, or the ability to remove all data quickly and completely from a cloud environment, would be important at the end of a disaster, but would not be important during setup and deployment. Elasticity, or the ability to resize resources to meet current demand, would be very beneficial to a BCDR situation, but not as vital as portability.