The question is testing the understanding of the meta-model concept in linguistics. The correct answer is 'Deep structure' which refers to the underlying meaning and all the relevant knowledge that is not explicitly stated. 'Surface structure' (A) is the actual words spoken, which do not capture the full meaning. 'Contextual structure' (C) is not a standard term in this context, and 'Literal structure' (D) would refer to the exact, dictionary definition of the words used, ignoring any implied meaning.