C++ programming, add explain, please.

You have a list, depicted below. 116-17-20] 1.2 head tail The following code runs: temp tail->prev->prev temp->prev->next = temp->next temp->next->prev = temp->prev; temp->nextNULL temp->prev = NULL; What is the node order when traversing the list from tail to head? Write each number separated by a single space Select one: O a. 20 16 11 17 12 b. 20 17 11 16 12 Oc. 20 16 17 12 d. 20 17 16 12 Check