A rootkit (Option A) is a type of malware designed to gain administrative (root) access to a system while hiding its presence. Rootkits can manipulate system processes and files to remain undetected, making them particularly dangerous.
* Trojan (Option B) is malware disguised as legitimate software but doesn't necessarily provide administrative access.
* Worm (Option C) spreads across networks but doesn't grant administrative access.
* Ransomware (Option D) encrypts data and demands a ransom but doesn't typically provide ongoing administrative access.
CompTIA A+ Core 2 References:
* 2.3 - Explain malware types, including rootkits and their purpose .