Subject. Data structure.

I need the correct answer for number.

1,12,18,19,20

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Please give me correct answer please.

. In the linked list version of the queue class, which operations require linear time for their worst-case behavior? a. dequeue b. enqueue c. isEmpty d. size e. None of these operations require linear time. 2. What happens when you push a new node onto a stack? a. The new node is placed at the front of the linked list. b The new node is placed at the back of the linked list. c. The new node is placed exactly halfway between the front and the back of the linked list. d. The new node is placed at the middle of the linked list. e. No change happens The insertion operation in the stack is? a. Insert b. Pop c. Top d. Push 3. e. Remove In the linked list version of the queue class, with the sentinel nodes header and trailer, which of these nodes will change during an insertion into a NONEMPTY queue? a. Only header changes. b. Neither changes. c. Only trailer changes. d. Both change. 4. The values are removed from a stack in which order? a. Hierarchical b. Alternative c. Reverse d. Sequential e. Random 5. 6. The term push and pop are related to a. Stacks b. Arrays c. Lists d. Trees e Queues 7. Which is the pointer associated with the stack? a. First b. Front c. Top d. Rear e. Side