Concept:The idiom 'in black and white' refers to something that is clearly written down or formally documented, not spoken or hidden.Explanation:The phrase comes from the contrast of black ink on white paper. It means information is recorded in a fixed, official written form. For example, a signed contract is 'in black and white'. The correct meaning is 'officially in writing'. The other options describe opposite ideas: 'in verbal form' is spoken, 'in secret' is concealed, and 'unclear terms' are vague or ambiguous. Therefore, only option A matches the idiom's meaning.Answer:Option A – Officially in writing