Question: A queue is implemented using a non - circular singly linked list. The queue has a head pointer and a tail pointer, as shown

A queue is implemented using a non $-$ circular singly linked list. The queue has a head pointer and a tail pointer, as shown in the figure. Let n denote the number of nodes in the queue. Let 'enqueue' be implemented by inserting a new node at the head, and 'dequeue' be implemented by deletion of a node from the tail.circular $-$ linked $-$ lis

Which one of the following is the time complexity of the most time $-$ efficient implementation of 'enqueue' and 'dequeue, respectively, for this data structure?

Your answer:

Theta $($ n $),$ Theta $($ n $)$

Theta $($ n $),$ Theta $(1)$

Theta $(1),$ Theta $($ n $)$

Theta $(1),$ Theta $(1)$

head tail

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