The heap data structure is the most efficient way of implementing the ..................a)None of the mentionedb)Priority queuec)Back queued)Front queue

The heap data structure is best suited for implementing a priority queue. This is because a heap allows for efficient retrieval and deletion of the highest (or lowest) priority element, making operations such as insertion and deletion take logarithmic time. In contrast, other methods like linked lists or arrays may lead to less efficient operations for the same tasks. Here’s a brief explanation of the other options:

• Back queue and Front queue do not correspond to operations that specifically utilize heaps.
• None of the mentioned is not applicable since the priority queue is indeed a valid use case for heaps.

Thus, the correct answer is b) Priority queue.