Final answer:
A subject directory is a navigation tool that doesn't require keyword entry, whereas a heuristic is a mental shortcut for problem-solving.
Step-by-step explanation:
Understanding Search Tools and Problem-Solving Methods
A subject directory is a type of search tool that allows users to navigate to areas of interest without having to enter keywords. The correct option to fill in the blank is a. directory. In contrast, a search engine requires users to input specific keywords to find information, and a hyperlink is a link from one web page to another, either on the same site or an external one.
When it comes to problem-solving, a mental shortcut in the form of a general problem-solving framework is called a b. heuristic. Heuristics are contrasted with an algorithm, which is a step-by-step procedure for solving a problem or accomplishing a goal.