This question concerns the legal basis for the delivery of official notices. In specific legal frameworks, procedural aspects like notice delivery are often codified within the relevant legislation. The correct answer is Section 40 of the Act.
When a specific "Act" is referenced, it is highly probable that its own sections define procedural matters like notice delivery. Section 40 would contain the specific rules for how notices are to be served, ensuring legal validity.
The Indian Evidence Act (A) deals with the admissibility of evidence in court, not primarily the procedure for delivering notices in administrative contexts.
The Constitution (C) provides fundamental rights and the framework of government, but specific procedural details for notice delivery are usually found in subordinate legislation or specific acts.
The Chairperson's instructions (D) would typically be based on the Act, not supersede it as the primary legal basis for delivery.