What type of device is used to secure data on electronic devices to prevent unauthorized access?

The correct choice is encryption software. This type of device or software is specifically designed to transform data into a coded format that can only be accessed or decrypted by individuals who possess the correct decryption key or password. It ensures that even if unauthorized users access the data, they cannot understand or utilize it without the proper credentials.

Firewalls are primarily used to monitor and control incoming and outgoing network traffic based on predetermined security rules, but they do not inherently secure data by encoding it. Security tokens are used for authentication purposes, providing a means to verify user identities but do not protect the data itself. A Faraday bag is used to block electromagnetic fields and prevent radio frequencies from reaching electronic devices, which is useful for protecting devices from remote access or tracking but doesn’t secure the data that resides on those devices. Thus, encryption software is the most effective tool for securing data against unauthorized access.