The document ________ decides which changes to accept

When using the problem solving tools, the first one to use is:

a. PAC Chart. b. IPO Chart. c. Algorithm. d. Flowchart.

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.