Final Answer:
The limit is undefined.
Step-by-step explanation:
In mathematics, the concept of a limit refers to the value that a function or sequence approaches as the input or index approaches a certain value. In this case, the options provided (a, b, c) are constant values, and therefore, they don't involve any variable approaching a specific point. As a result, the limit is considered to be undefined since there is no variable changing or approaching a certain value. In formal terms, when dealing with a constant sequence, the limit is undefined, as there is no variability in the values to approach any particular limit.