clarification needed on what is meant by exercising an action

Respected Madam/Sir,

CONTEXT
=======
In the context of the following statement in
https://www.w3.org/TR/odrl-model/#duty

...
If its action has not been exercised, then all consequences must also be
fulfilled to *fulfil* the Duty. That is, consequences are *additional* Duties
that must also be fulfilled.
....

QUESTION
========
Exercise as per dictionary (in this context) means
*        use or apply (a faculty, right, or process).*

So does the above statement mean

(a) the consequence has to be fulfilled if the action has not been
performed
*or*
(b) the consequence has to be fulfilled if the action had been performed
but had failed.

POSSIBLE ANSWER
===============

It seems that (b) is the interpretation in the light of the statement
...That is, consequences are *additional* Duties ...

REDIRECT
========

Please do point me to message(s) in public-odrl  or
public-odrl-contrib if this has already been answered
as my search did not yield a desired result.

thank you

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