Delaware requires agency disclosure:

Agency disclosure is a fundamental concept in real estate that protects both consumers and licensees. In Delaware, as in most states, agency relationships create fiduciary duties that bind agents to act in their clients' best interests. The timing of disclosure is crucial because it informs parties of their rights and obligations before significant decisions are made. This question tests knowledge of Delaware's specific disclosure requirement. The correct answer is B - disclosure must occur at first contact or showing. This timing ensures transparency from the outset of the business relationship. Option A (at closing) is incorrect because disclosure at this late stage would deprive parties of important information during decision-making. Option C (only if requested) is wrong because disclosure is mandatory, not optional. Option D (never) is clearly incorrect as disclosure is legally required. This question challenges students because it requires knowing the specific timing requirement for disclosure in Delaware, which may differ from other states.