[amp_mcq option1=”Queue” option2=”List” option3=”Vector” option4=”Stack” correct=”option1″]
The correct answer is: A. Queue
A queue is a data structure that stores items in a first-in, first-out (FIFO) order. This means that the first item added to the queue will be the first item removed.
In backward chaining, the goal is the desired output of the algorithm. The algorithm starts with the goal and works backwards, trying to find a set of facts that would lead to the goal. If the algorithm finds a set of facts that would lead to the goal, it returns the set of facts. If the algorithm cannot find a set of facts that would lead to the goal, it fails.
A queue can be used to implement backward chaining because it allows the algorithm to keep track of the facts that it has already considered. The algorithm can add new facts to the queue as it finds them, and it can remove facts from the queue as it proves them. This allows the algorithm to efficiently search for a set of facts that would lead to the goal.
The other options are incorrect because they are not data structures that store items in a FIFO order. A list stores items in a linear order, a vector stores items in a contiguous block of memory, and a stack stores items in a last-in, first-out (LIFO) order.