Types of Availability Attacks

[Winny]

I have just completed Domain 1: Security Principles and there was 1 practice question I got wrong:

Spoiler

Understand why Ransomware can be an Availability attack, but can anyone help explain why DDoS is not an Availability attack? From my understanding DOS attacks basically spam a server with traffic to make it crash and prevent availability of data for legitimate users?

Thank you very much

[Steve-Wilme]

It's not a fantastic question, but often ISC2 are looking for the most correct answer.  In this case ransomware directly targets data, whereas a DDoS overloads infrastructure.  

[Winny]

Thank you so much!