A company's database is leaking data due to attacks manipulating the SQL queries and injecting malicious code. What should be implemented?

A Virtual Private Network (VPN) secures data transmission over the internet by encrypting the connection between the user and the server, but it does not address vulnerabilities in SQL queries. While a VPN can protect data in transit, it does not prevent SQL injection attacks at the application level, where the actual exploitation occurs.

Firewalls serve as a barrier between trusted and untrusted networks, controlling incoming and outgoing traffic. However, they do not specifically protect against SQL injection attacks that occur within the application itself. Firewalls can help mitigate external threats, but they are not a substitute for input validation.

Full-disk encryption protects data stored on a disk by encrypting the entire drive, safeguarding it from unauthorized access if the device is lost or stolen. However, it does not prevent SQL injection attacks that manipulate queries to gain unauthorized access to data contained in the database. This method focuses on data at rest rather than data being actively processed.