Explanation/Reference:
Explanation:
Decision trees use questionnaires to lead a user through a series of choices until a conclusion is reached.
Rules refer to the expression of declarative knowledge through the use of if-then relationships. Semantic nets consist of a graph in which nodes represent physical or conceptual objects and the arcs describe the relationship between the nodes. Semantic nets resemble a dataflow diagram and make use of an inheritance mechanism to prevent duplication of data.

The best strategy to optimize data storage without compromising data retention practices is to limit the size of file attachments being sent via email. This strategy can reduce the amount of storage space required for email messages, as well as the network bandwidth consumed by email traffic. File attachments can be large and often contain redundant or unnecessary information that can be compressed, converted, or removed before sending. By limiting the size of file attachments, the sender can encourage the use of more efficient formats, such as PDF or ZIP, or alternative methods of sharing files, such as cloud storage or web links. This can also improve the security and privacy of email communications, as large attachments may pose a higher risk of being intercepted, corrupted, or infected by malware.
References:
* Data Storage Optimization: What is it and Why Does it Matter?
* Data storage optimization 101: Everything you need to know

Explanation/Reference:
Explanation:
Implementing data backup and recovery procedure is a corrective control, because backup and recovery procedures can be used to roll back database errors. Defining or establishing standards is a preventive control, while monitoring for compliance is a detective control. Ensuring that only authorized personnel can update the database is a preventive control. Establishing controls to handle concurrent access problems is also a preventive control.