Question: What is the primary purpose of the \'visited\' set in Dijkstra\'s algorithm?

Options:

1. To store the shortest path
2. To avoid processing the same vertex multiple times
3. To keep track of the edges
4. To maintain the priority queue

Correct Answer: To avoid processing the same vertex multiple times

Solution:

The \'visited\' set is used to avoid processing the same vertex multiple times, ensuring that each vertex is only processed once.