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.