In an insertion or deletion routine: how many pointers are you required to create for use during the traversal process?
a. two: one for the node under inspection and one for the previous node
b. two: one for the node under inspection and one for the next node
c. one: for the node being inserted or deleted
d. three: one for the node under inspection, one for the next node, and one for the following node
a. two: one for the node under inspection and one for the previous node
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