What specific actions does the author say will allow scientists to study the
brain by reverse engineering? (the coming of merging of mind and machine)

a. the use of nanobots, which explore the brain's activity through the
bloodstream
b. intelligence testing, which gathers data based on research
subjects' test scores
c. around-the-clock observation, which gives researchers insight into
human behavior patterns
d. computer-based brain studies, which use computers to simulate
brain activity