Final answer:
The brute force method for finding the cheapest circuit is not always effective and should not always be used with any graph.
Step-by-step explanation:
The answer is b) False. The brute force method for finding the cheapest circuit is not always effective and should not always be used with any graph. The brute force method involves calculating the cost of all possible circuits and selecting the one with the lowest cost. However, this method can become impractical or inefficient for large graphs with many vertices and edges. In such cases, more efficient algorithms like Prim's algorithm or Kruskal's algorithm are often used to find the cheapest circuit.