During the forensic a phase of a security investigation, it was discovered that an attacker was able to find private key

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During the forensic a phase of a security investigation, it was discovered that an attacker was able to find private keys on a poorly secured team shared drive. The attacker used those keys to intercept and decrypt sensitive traffic on a web server. Which of the following describes this type of exploit and the potential remediation?

A. Session hijacking; network intrusion detection sensors
B. Cross-site scripting; increased encryption key sizes
C. Man-in-the-middle; well-controlled storage of private keys
D. Rootkit; controlled storage of public keys