The first step in traversing a linked list, is to $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_?$

Select one:

a$.$

$...$check that the last node has a null pointer.

b$.$

$...$create a walking pointer to the first node.

c$.$

$...$count the number of nodes to determine how many iterations are necessary.

d$.$

$...$set the address of where in the linked list the traversing must start.