I am looking to buy an expensive flat$-$screen television. I visit a number of stores to see their prices and then find the same model online at a lower price. This is an example of which of the following:

a$.$

brick and mortar

b$.$

intermediary

c$.$

showrooming

d$.$

viral marketing

e$.$

webrooming

b$.$

Uber sold its China business to the $$Uber of China$$ Didi.

c$.$

Walgreens and TaskRabbit worked together on drug store deliveries.

d$.$

Toyota has struck a leasing deal with Uber.

e$.$

Google parent Alphabet invested in both Uber and rival Lyft$.$