Let us say a generated sequence is enumerable if every value in the sequence will eventually be produced, assuming the generator is queried long enough. Consider the message atEachGenerate; under which of the following conditions is the resulting sequence enumerable?
a) The underlying generator is finite; each of the intermediate generators is finite.
b) The underlying generator is finite; however, some of the intermediate generators are infinite.
c) The underlying generator is infinite; however, all of the intermediate generators are finite.
d) The underlying generator is infinite, and some of the intermediate generators are also infinite.