Which type of malware modifies the core system files of an operating system to grant administrative access to an attacker while completely hiding its own presence?

Name: CREST Olympiads
Address: Office No. 234, Spaze iTech Park, Tower-B2, 2nd Floor, Sohna - Gurgaon Rd, Sector 49, Gurgaon, 122018, IN
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A Ransomware
B Trojan Horse
C Rootkit
D Spyware