Which of the following statements about stacks is incorrect?
(a) stacks can be implemented using linked lists.
(b) stacks are first in, first-out (FIFO) data structures.
(c) new nodes can only be added to the top of the stack.
(d) the last node (the bottom) of a stack has a null (zero) link.
(b) stacks are first in, first-out (FIFO) data structures.
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