State whether each of the following is true or false. If false, explain why.

a) In a queue, the first item to be added is the last item to be removed.

b) Trees can have no more than two child nodes per node.

c) A tree node with no children is called a leaf node.

d) Linked-list nodes are stored contiguously in memory.

e) The primary operations of the stack data structure are enqueue and dequeue.

f) Lists, stacks and queues are linear data structures.