The data retention policy covers the duration, format, technologies, protection, and accessibility of archives, but does not address the specific costs of its implementation and maintenance.

Under the Federal Rules of Civil Procedure, data custodians are assumed and expected to have full and comprehensive knowledge of the internal design and architecture of their systems. In a cloud environment, especially with PaaS and SaaS, it is impossible for the data custodian to have this knowledge because those systems are controlled by the cloud provider and protected as proprietary knowledge.

Explanation
Data masking does not support authentication in any way. All the others are excellent use cases for data masking.