A Chief Financial Officer $($CFO$)$ has been receiving email messages that have suspicious links embedded from unrecognized senders$.$ The emails ask the recipient for identity verification. The IT department has not received reports of this happening to anyone else. Which of the following is the MOST likely explanation for this behavior?

a$.$

The CFO is the target of identity fraud.

b$.$

The CFO is experiencing an impersonation attack.

c$.$

The CFO is receiving spam that got past the mail filters.

d$.$

The CFO is the target of a whaling attack.