Egan suggests which of the following reasons for the utility of studying tv/internet and parent-child interactions:

a. TV is an established medium, present in American society prior to the birth of
today's children and omnipresent in our culture
b. The Internet is a newer medium, still establishing its place in our culture, and
perhaps perceived differently by those introduced to it as children or as adults
c. Censorship technologies: are not on every television and computer, become
obsolete, and can be over-ridden by clever children
d. All of the above
e. None of the above

d.