Q4.(a) Counters are classified as Synchronous and Asynchronous.Explain the difference between them. [2marks! (b) A counter is required to count the number of milk bottles filled automatically in milk plant.A photocell and light source combination are used to generate a single pulse each time a bottle cross the path of this combination.!f 2000 bottles are to be counted,find the minimum number of flip-flops required 1o construct the counter. [Smarks} (c) With the aid of a circuit diagram show how four flip-flops can be interconnected to reduce the normal 16 count to 10 count [8marks} (d) Explain how the decade counter works [5marks]