Which of the following statements inserts a new node, pointed to by newPtr, at the end of a linear linked list?

a. newPtr->next = cur;
prev->next = newPtr;
b. newPtr->next = head;
head = newPtr;
c. newPtr->next = NULL;
d. prev->next = cur;
newPtr->next = cur;

a. newPtr->next = cur;
prev->next = newPtr;