Which one of the following statements about Disruptive innovation is true?
a. It generally does not have a clear, well-defined problem, but it has a well-defined domain definition (what resources and which firm).
b. It generally has both a clear, well-defined problem and well-defined domain definition (what resources and which firm).
c. It generally has a clear, well-defined problem, but it does not have a well-defined domain definition (what resources and which firm).
d. It generally does not have both a clear, well-defined problem and well-defined domain definition (what resources and which firm).