What is the common theme found in the articles "Power of Entrepreneur Networks" and "The Rise of Silicon Alley"?

a$)$ Entrepreneurs in new technology regions primarily have technical backgrounds.

b$)$ New York City's technology hub did not attract venture capital.

c$)$ Entrepreneurs in successful technology "hot spots" promote the emergence of the entire ecosystem, not just their own business.

d$)$ Entrepreneurial "hot spots" only thrive with the help of low$-$interest loans.