Correct option is A
Explanation:
• Statement I is true. A Denial-of-Service (DoS) attack involves flooding a server or network with so many requests that it cannot process legitimate requests, which can cause it to slow down significantly or crash.
• Statement II is also true. A virus is indeed a type of malicious software that can replicate itself and spread from one computer to another. It often causes computers to run slowly due to the resources it consumes and the detrimental effects it can have on files and system processes.