Boolean searching:
Most searches will return too many or too few records. It takes a long time to look at hundreds of records. By putting a little effort into constructing search strings (what you type into the search box) you can save a lot of time. The database can do a lot of work for you if you take the trouble to add a little sophistication to your search strings.
To do this with databases you need to know about the Boolean system. By the use of a few simple linking words, called operators, you can make your searches much more precise.
It's either A or B. I would go with B though.
You have to give more detail
The answer is D. It does not state the life lesson, whereas a theme does.
