Whitney tells her friend Jan that she can wear the extra jacket that she keeps in her car. Whitney hands Jan her keys and heads off to class. Jan heads to Whitney's car with the set of eight keys. She looks at the keys, noting that two are too small to be car keys, and then she looks for any key that might have a symbol associated with a particular car. She finds two keys that have a shape on them like the hood ornament on Whitney's car. So, these will be the only two keys of the eight that she will try. To solve this "key" problem, Jan used

a. functional fixedness
b. an algorithm
c. a heuristic
d. a random search strategy

c