Which of the following loops correctly uses iter as an iterator to move through the nodes of the linked list?
NodePtr iter; //a pointer to a node
a. while(iter != NULL)
iter++;
b. while(iter != NULL)
iter=iter->link;
c. for(iter=NULL; iter != NULL; iter=iter->link)
d. for( iter=head; iter != NULL; iter=iter->link)
d. for( iter=head; iter != NULL; iter=iter->link)
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