Please strictly follow the given sequence (1-2-3) in cleaning the CFGS: 1: useless symbols (1) 2: unnecessary e-productions 3: unit productions in the given grammar a) S -> ABA |C A -> Sa | B -> bB | b C -> CA b) S -> BC A -> a b B -> C -> DE | D -> BAB E -> C c) S-> BC | DaD | b A -> aD | bA | C B -> Cb C -> aB D -> bS | d) S-> A | B A -> aA | aC B -> bB | bC C -> cdfF D -> g | E-> h F -> DE 1. In a simple computer network (Figure III), what are the components A, B, C, D, E respectively? 2. What does NOS stand for? (2 points) What is its main function? PC A NOS PC Figure III Components of a Simple Computer Network t