A Melbourne medical practice was hit with ransomware in February $2019.$ The practice used electronic health records for all patient data. As a result of the ransomware, all patient medical data was encrypted. The medical practice did not have a backup of the patient data, and did not have the decryption key. Which one of the following statements best describes a vulnerability associated with this situation?

Group of answer choices

The ransomware

The electronic patient health records

The attacker who released the ransomware

The lack of backup copies of critical practice information