Are the following languages context-free or not? If yes, specify a context- free grammar in BNF notation that generates the language. If not, give an informal argument. (a) { ambne I m n (b) { a"bin l n 0 }, with alphabet = {a, b} (c) { wwR I w . and wR s w in reverse }, with alphabet -(a, b} (d) { a"brend" l n > 0, m > 0 }, with alphabet = {a, b, c, d} (e) { w | w has no more than 3 symbols), with alphabet ={a, b} 0, o > 0), with alphabet {a, b, c}