How does course hero work

study guides, infographics, class notes, step-by-step explanations, essays, lab reports, videos, user-submitted questions paired with answers from tutors, and original materials created and uploaded by educators. Users either buy a subscription or upload original documents to receive unlocks that are used to view and download full Course Hero documents.[2]

Explanation:

Course Hero offers a Basic (free) Membership as well as a paid Premier Membership. ... All members also have the ability to earn Unlocks and Questions by contributing their own study documents to Course Hero's library; you can earn 5 Unlocks or 3 Questions (up to 9) for every 10 study documents submitted.

given the options, i would say your best bet is c. the modem supports up to 56 kbps, which is too low for video streaming. dial up modems use actual phone lines, which only can go up to 56 kbps as that's more than sufficient for traditional phone calls. this is also the reason why when a dial-up modem connects, you hear all those sounds. it's literally using the phone line to establish a connection.