Question: Concerning Stack and Queue, which of the following statement ( s ) is / are correct? A . Data are saved sequentially in a stack.

Concerning Stack and Queue, which of the following statement(s) is/are correct?
A. Data are saved sequentially in a stack.
B. We can sometimes get the element in the bottom of a stack directly.
C. A queue can be implemented not based on a list.
D. Data can always be inserted at the head of a queue directly.
Concerning Stack and Queue, which of the following statement(s) is/are correct?

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