Q1. Signatures and behaviours Suppose that we have a system with two inputs, each of type {0, 1, 2, 4} and one output of type {true,false}. (a) What could be a signature for the system. (b) How many behaviours belong to this signature. (c) How many specifications have this signature? (d) Which of these behaviours are accepted by a specification that says that the output is true if and only if the first input is less than the second.