All of the Following Can Be Indications of a Ransomware

All of the following can be indications of a ransomware attack EXCEPT?

A) The inability to access certain files.
B) An increased amount of spam email in an individual's inbox.
C) An increase in activity of the CPU of a computer for no apparent reason.
D) The detection of suspicious network communications between the ransomware and the attacker's command and control servers.