2. (15 marks) Consider the language that contains the predicates of symbols degree, student, pass, test, goodscore, and subscribe, all of arty 0 . Given the following knowledge base built from this language: degree student pass. pass test goodscore. test subscribe. student. subscribe. (a) (5 marks) How many interpretations exist for this propositional language? (b) (5 marks) Consider the following interpretations