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B. elements can be added to or removed from either the front or rear
Dequeue, short for “double-ended queue,” is a data structure that allows the addition and removal of elements from both the front and back ends. This flexibility makes it a versatile data structure that can be used in various applications, such as storing tasks in a queue with the ability to prioritize some tasks by adding them to the front. Essentially, it combines the features of both stacks and queues, offering two ends for operations. The operations possible on a dequeue include insertion and deletion of elements from both the front and rear, as well as operations for peeking at the front and rear elements without removal. Implementations of deques can be found in many programming libraries, offering both fixed and dynamic sizes.