List three different sets of keywords that could be used to search for information on how to maintain a trumpet.

Set 1: "Trumpet", "Maintenance", "Instructions"

Set 2: "How to", "Trumpet", "Care", "Instrument"

Set 3: "Proper", "Clean", "Service", "Trumpet"

Explanation:

Actual search engines allow very advanced searches, using multiple words related with your objective will improve the results obtained. Also you can refine your search by using specific operators to include or exclude words, websites, file types or dates.

For example in Google search, using + and - will force the results to include and exclude respectively the  following word. Typing several words between " (double quotes) will search specifically for that sentence, the same words and in the same order. Using filetype: will restrict results of a specific file extension, like jpg, or pdf.

There are many other operators available, you can find more information about this by looking for "advanced search operators" of your favourite search engine.

answer; i believe the correct answer is (b) by using a multimeter;