Which of the following factors may render a token based solution unusable?

A.
Token length

B.
Card size

C.
Battery lifespan

D.
None of the choices.

Explanation:
Another limitation of some of the tokens is their battery lifespan. For example, in the
case of SecurID you have a token that has a battery that will last from 1 to 3 years
depending on the type of token you acquired. Some token companies such as Cryptocard
have introduced tokens that have a small battery compartment allowing you to change the
battery when it is discharged.