In a doubly linked chain implementation of a queue, what is the performance when the dequeue operation
a. o(1)
b. o(n)
c. o(logn)
d. o(n2)

A) O(1)

Explanation:While dequeuing operation takes place,that is the elimination of the front element from the queue.In doubled linked list/chain, the dequeue operation operates at the consecutive elements lined in the chain with O(1) time period for the eliminating the item  or returning the last value from the link along with the reference.from the chain link.Therefore, the correct option is option(A).

answer; its the top layer;

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