How to calculate decision table conditions and actions on the following questions. The following specification is given: A railway has four different kinds of accommodation with different ticket prices: Hard seat, soft seat, hard sleeper, and soft sleeper. For hard sleeper, there are different prices for lower, middle and upper berth. For soft sleeper, there is a different price for lower and upper berth. For sleeping accommodation, different prices apply for non-air-condition and aircondition. For soft sleeper, a higher price applies for compartments with own bathroom. High-speed trains exist, but have only hard and soft seat, and they have another price than “normal” trains. How many different valid combinations of inputs exist for computing the price? a) 12 b) 16 c) 18 d) 36