Which of the following is not a characteristic of a counter-based token device?

Which of the following is not a characteristic of a counter-based token device?

A.
Generates a one-time password

B.
It shares a secret key with the authentication service

C.
It is based on time synchronization

D.
It is a type of synchronous authentication scheme

Explanation:
There are two types of synchronous-based token devices, counter-based and timebased. Counter-based means that the authentication service and the token share the same list of access codes and secret key. The secret key is used to encrypt the access code, which is the one-time password the user enters for authentication.