What are double and single threaded trees?Marks : 1Negative Marks : 0Answer hereUsing single and double linked listsHaving 2 and 1 nodeWhen both left, right nodes are having null pointers and only right node is null pointer respectivelyUsing heaps and priority queues

It seems like you've mixed up a few concepts. Let me clarify:

Single and double threaded trees are types of binary trees that maintain a certain order for efficient traversals.

1. Single Threaded Trees: In a single threaded binary tree, each node is threaded towards either its in-order predecessor or successor (meaning, its right or left pointer points to its next node in the in-order sequence). This means that if a node has a null right child, then the right pointer points to its in-order successor. This helps in doing an in-order traversal of the tree more efficiently.

2. Double Threaded Trees: In a double threaded binary tree, each node is threaded towards both its in-order predecessor and in-order successor (meaning, its right pointer points to its next node in the in-order sequence and its left pointer to the previous node). This means that if a node has a null right child, then the right pointer points to its in-order successor and if it has a null left child, then the left pointer points to its in-order predecessor. This helps in doing a reverse in-order traversal of the tree more efficiently.

These trees do not involve the concepts of linked lists, heaps, or priority queues directly. They are a way to enhance the functionality of binary trees.