The correct answer is 'Corporate espionage for competitive advantage' as organized crime groups engaging in cyber attacks are often motivated by the potential financial gain or strategic advantage. In this case, the targeted R&D department and the known involvement of a criminal syndicate that engages in corporate espionage suggest that the primary motivation is to steal intellectual property to gain a competitive advantage. 'Attempt to disrupt services for ideological reasons' would be more consistent with hacktivism. 'Looking to encrypt data for ransom' would be indicative of a ransomware attack. 'Harvesting credentials for resale on dark web markets' would not typically involve targeted exfiltration of specific departmental data.