Section: General Aptitude | Marks: 1
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 ________.
- A. 2
- B. 3
- C. 4
- D. 5