$4.$ Key Concepts in Data Security

a$.$ Define the concepts of Confidentiality, Compliance, Integrity, and Availability in the context of data security.

b$.$ Explain the importance of each concept and how they interrelate to ensure a secure data environment.

c$.$ Discuss potential risks or threats to each of these concepts and provide examples.

d$.$ What measures can be implemented to safeguard against these risks and ensure data security?