Calculate the fall time for the below model of CMOS under High to Low transition. Given that the value of Vout is given by the following equation: Vout = VDDe −t/RnCL (where VDD, Rn and CL are 5 V, 100 Ω and 100 pF respectively). Also, assume that the boundaries of LOW and HIGH levels are 1.5 V and 3.5 V respectively. Give your answer in terms of nanoseconds (ns) and rounded to 2 decimal places.