Which of the following is false about denial-of-service (DDoS) attack?
This attack can be spread in a multitude of systems.
It denies service to the system to legitimate users.
It can exploit a vulnerability in one computer system and makes it the DDoS master.
A network-centric attack overloads a service by using up bandwidth and an application-layer attack, which overloads a service or database with application calls.
It gains malicious access to resources, applications or databases.