Consider the C code fragment given below.typedef struct node { int data; node* next; } node; void join(node* m, node* n){ node* p = n; while(p->next != NULL) { p = p->next; } p->next = m; }Assuming that \(m\) and \(n\) point to valid NULL-terminated linked lists, invocation ofjoin will

Let us analyze what happens when join(m, n) is called:

1. Pointer p is initialized to n (node* p = n;).

2. If list n is empty, i.e., n == NULL, accessing p->next in the condition while(p->next != NULL) attempts to dereference a NULL pointer, which causes a null pointer dereference (segmentation fault / runtime error).

3. If list n is non-empty (n != NULL), the while loop traverses to the last node of list n (the node where p->next == NULL).

4. Once the loop terminates at the last node of n, the statement p->next = m; sets its next pointer to point to the head of list m, effectively appending list m to the end of list n.

Therefore, depending on whether list n is empty or non-empty, the function will either cause a null pointer dereference or append list m to the end of list n.

Hence, (B) is the correct option.