4. Exercise 8.1.10 (2 points)(a) Find a recurrence relation for the number of bit strings of positive lengthnthat containthe bit string 01. Your final answer should not contain any summations or "...".(b) What are the initial conditions for the recurrence in part (a)?Note:To earn full credit, you must have the minimum number of initial conditions asrequired by your recurrence relation from part (a).