Final answer:
Suppliers are the ones not consulted when a company only uses internal sources for developing new-product ideas, as they are external to the company's internal structure.
Step-by-step explanation:
When a company decides to use only internal sources for developing new-product ideas, it means they would utilize resources within the organization. The options provided are different potential sources, and we are looking for the one that is not internal to the company. Executives and professionals, company records and data, and intrapreneurial programs are all resources that exist within a company. Salespeople are also part of the company and would provide insights from their interactions with customers. The one that stands out as not being an internal source is suppliers, as they are external entities that provide goods or services to the company but are not part of the internal staff or structure. Thus, when focusing solely on internal sources for idea generation, suppliers would not be consulted.