A telecommunications company uses the AES method for ensuring that confidential information is protected.

The AES (Advanced Encryption Standard) method is a symmetric-key algorithm, meaning the same key is used for both encrypting and decrypting data1. This type of control is considered preventive because it is implemented to prevent unauthorized access to confidential information by ensuring that the data is unreadable to anyone who does not have the key. References: = The explanation is based on the general understanding of encryption as a security control within the field of information security, particularly as it pertains to the ISO/IEC 27001 standard for information security management systems (ISMS), which includes encryption as a preventive control measure.