What are the main components of the NIST Cybersecurity Framework?

What are the five functions of the NIST Framework Core?

What is a recommended usage of the Detect function?

At what cyber kill chain stage do attackers use malware to exploit specific software or hardware vulnerabilities on the target, based on the information retrieved at the reconnaissance stage?

A bank has been alerted to a breach of its reconciliation systems. The notification came from the cybercriminals claiming responsibility in an email to the CEO. The CEO has alerted the company CSIRT.
What does the Communication Plan for the IRP specifically guide against?