$\_\_\_\_\_\_\_\_$ occurs when computer criminals invade a computer system and replace legitimate programs with their$$ own, unauthorized ones that shut down legitimate applications and substitute their own processing to$$ spy$,$ steal and manipulate$$ data, or achieve other purposes.

Question content area bottom

Part $1$

A$.$

Denial of service

B$.$

Phishing

C$.$

Hacking

D$.$

Spoofing

E$.$

Usurpation