Final answer:
The executive summary in a proposal provides a concise overview of the key points, including the problem and proposed solution, but it is not the longest section and is included in both large and small-scale proposals, not primarily on technical details.
Option 'a' is the correct.
Step-by-step explanation:
When attempting to identify a true statement about an executive summary included in the written proposals given by salespeople to prospective buyers, it's important to understand the role it plays in the proposal.
The correct option is that An executive summary provides a concise overview of the key points in the proposal. This means that the executive summary should briefly present the main problem, the proposed solution, and the highlights of what makes the proposal valuable and worthy of consideration.
An executive summary is not typically the longest section of the proposal; rather, it is a brief synopsis.
It is included in proposals for both small-scale and large-scale purchases, and while it's important, it is not primarily focused on technical details. The executive summary serves to quickly inform the reader about what to anticipate in the full document, hence fostering better understanding and potentially leading to the reader’s interest in reading further.