i need detalied explntion for why its answer is correct and also want explanation why thr other answers are not correct. make sure its please to understand wht im asking in answer

A manufacturer's solicitation documents occasionally include detailed design specifications that are considered proprietary. Several potential suppliers from developing countries have expressed interest in offering products or services to the manufacturer company. Which of the following actions will MOST likely help balance intellectual property protection with the expanded supplier base? a) Sourcing strictly from suppliers in advanced industrial countries b) Checking supplier references and past performance c) Drafting strong contract language concerning confidentiality d) Defining where any disputes will be settled