A string instrument can indeed be played using all the techniques you mentioned:
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Bow (Arco): Drawing a bow across the strings is a technique used in instruments like the violin, viola, cello, and double bass.
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Plucking (Pizzicato): Plucking the strings with the fingers is another common technique used in various string instruments, allowing for a different tone and articulation.
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Tapping (or other percussive techniques): Tapping on the wood parts of the instrument, often referred to as "tap" or "slap" techniques, can also produce sound and is sometimes used in more contemporary or experimental playing styles.
So, the correct answer is that a string instrument can be played using all of the above methods.