Boolean expressions are those expressions whose value can only be true or false.
The required boolean expression is: s == "end"
From the question, we have the following highlights
For the boolean expression to be true, then we need a comparison operator.
For this purpose, we make use of the == operator
Hence, the required boolean expression is: s == "end"
Read more about boolean expressions at:
https://brainly.com/question/16843003