Final answer:
The subject is Computers and Technology, and the answer explains the importance of security features in telecommunications software and identifies the feature that is not related to security.
Step-by-step explanation:
The subject of this question is Computers and Technology and it is suitable for High School students.
**Security** is a top concern of network management today, so **telecommunications software** must provide the following features to ensure secure communication:
- Encryption - This is the process of converting data into a secure format to prevent unauthorized access. It ensures that only the intended recipient can decipher the information.
- Authentication - This verifies the identity of users and devices to prevent unauthorized access.
- Redundancy - This involves having backup systems and failover mechanisms to ensure continuous operation even if there is a hardware or software failure.
- Compression - This is not directly related to security. Compression is the process of reducing the size of data to optimize transmission and storage.
Therefore, the correct answer is d) Compression.