Final answer:
David Cook created software for Blockbuster based on a demo by leveraging his programming skills and knowledge of software development.
Step-by-step explanation:
David Cook created software for Blockbuster based on a demo by leveraging his programming skills and knowledge of software development.
He would have utilized programming languages such as Java, C++, or Python to write the code for the software.
A demo serves as a proof-of-concept or prototype that showcases the functionality and features of the software to Blockbuster, enabling them to make an informed decision about whether to proceed with its development.