Please help explain and how to solve a-c thank you

4. Consider the following chain mechanism: (1) AHk1A+H (2) A. k2 B. +C (3) AH+Bk3A+D (4) A+Bk4P (a) Identify the initiation, propagation, and termination steps. (b) Write the rate law for the rate of disappearance of AH,dtd[AH]. Leave in terms of reactive intermediates. 1 (c) Write expressions for the net-rate of reaction of the intermediates, A. and B. dtd[A]= and dtd[B]= ? Appling the steady-state approximation, what are the numerical values of each of these rates