Philip is out shopping for a motorcycle. He sees a motorcycle he really likes, but he seems to remember reading something about its gas mileage. He racks his brain trying to remember but is unable to recall the information. He therefore decides to come back another day. He goes home and researches the motorcycle on the Internet. During his information search, Philip performed and then

a$.$ an external search; an internal search

b$.$ an internal search; another internal search

c$.$ an internal search; an external search

d$.$ an external search; another external search

e$.$ an information search; an internal search