Consider the following languages:
L1 = {an bm cn+m: m, n ≥ 1}
L2 = {an bn c2n : n ≥ 1}
Which one of the following is TRUE?
(A) Both L1 and L2 are context-free.
(B) L, is context-free while L2 is not context-free.
(C) L2 is context-free while L1 is not context-free.
(D) Neither L1 nor L2 is context-free.