Answer:
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.
