Confidentiality in cybersecurity

Question:
Confidentiality in cybersecurity is about:

1. making sure the data is what we expect it to be, by keeping backups of data in different versions and securely checking for changes
2. making sure data is consistently, reliably available to those who are authorized
3. keeping secrets to yourself
4. enforcing and ensuring levels of access - who can see this, and who shouldn’t?

Answer:
D - is the correct answer