What is the main function of the Amnesic Incognito Live System or TAILS device?

What is the main function of the Amnesic Incognito Live System or TAILS device?
A . It allows the user to run a self-contained computer from a USB device.
B . It accesses systems with a credential that leaves no discernable tracks.
C . It encrypts data stored on any computer on a network.
D . It causes a system to suspend its security protocols.

Answer: A

Explanation:

Reference: https://www.wired.co.uk/article/tails-operating-software