NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Let Ai be the set of all nonempty bit strings $($i$.$e$.,$ bit strings of length at least one$)$ of length not exceeding i$.$

Identify $\backslash$cup i$=1$nAi

$.$

Multiple Choice

$\{\}$

A$1$

An

$\{0\}$