If variable answer stores a Boolean value, then what are the possible values for the variable?

0 or 1

"true" or "false"

true or false

any value

true or false and 0 or 1.

Explanation:

The boolean variable can have only two values that can be true or false.

Since we have variable answer of type boolean it can store true or false. In boolean algebra 0 is considered as false and 1 is considered as true. So we can also store 0 or 1 in boolean. If we store any other value in boolean algebra it will be regarded as 1 because only 0 is considered as false everything else is true.