Keys are often used in linked lists because:
A. without a software key, a linked list is locked to all clients and, therefore, rendered unusable
B. the values of the keys need to be duplicated in many of the nodes
C. we often need to search for nodes of interest, and we find that node by looking for some particular value in the node, usually a key
D. then, the client does not need to pass in a key as a parameter
C
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