Internet sites often vanish or move, so that references to them can't be followed. In fact, $13\%$ of

Internet sites referenced in papers in major scientific journals are lost within two years after

publication. Suppose you are researching obesity rates in the U$.$S$.$ You find Medical scientific

journal articles with links to $3$ Internet sites that you are interested in$.$ All the articles were written

prior to $2020.$ What is the probability that all $3$ Internet articles are still good and that you can link to

them? Assume that the three links are independent. $($You can model this with a Tree Diagram$)$

a$.)0\mathrm{.}13$

b$.)0\mathrm{.}39$

c$.)0\mathrm{.}169$

d$.)0\mathrm{.}0022$

e$.)0\mathrm{.}6585$