Final answer:
The correct answer is 3) Secure encryption. Data breaches, unauthorized access, and informed consent are the three most common issues related to the storage and use of personal data.
Step-by-step explanation:
The correct answer is 3) Secure encryption. Secure encryption is actually a solution to protect personal data rather than an issue. Encryption is a method of encoding information so that only authorized individuals can access it. It is used to ensure data confidentiality and prevent unauthorized access to personal information. The other options, 1) Data breaches, 2) Unauthorized access, and 4) Informed consent, are the three most common issues related to the storage and use of personal data. Data breaches refer to incidents where personal data is accessed or stolen by unauthorized individuals. Unauthorized access is when individuals gain unauthorized entry to personal data. Informed consent refers to the practice of obtaining explicit permission from individuals before collecting and using their personal data.