With given this context-free grammar, answer the following questions: II = > -- + - a. Using left-most derivations, attempt to derive the following sentences (20 points II B =B-AO II B = BB-AO b. Either of the sentences valid for the language? If so, which one(s) and why? With given this context-free grammar, answer the following questions: II SA T = Axt" a. Using left-most derivations, attempt to derive the following sentences (20 points): II B = B - AO II B = BB-AO b. Either of the sentences valid for the language? If so, which one(s) and why