Consider an art gallery whose walkways are shown as lines in the diagram. A…

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Consider an art gallery whose walkways are shown as lines in the diagram. A black dot represents a junction of two walkways. A guard may be placed at a junction to watch over the walkways that join at that junction. The minimum number of guards needed to watch all the walkways is ________.

1. A.

   2

2. B.

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3. C.

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4. D.

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