Final answer:
Gustav cannot share with Romulus the confidential information he knows about Polycarp's new product because he has a duty not to disclose confidential information he acquired while working for Polycarp.
Step-by-step explanation:
The correct statement in this scenario is C: Gustav cannot share with Romulus the confidential information he knows about Polycarp's new product because he has a duty not to disclose confidential information he acquired while working for Polycarp.
When an employee leaves a company, they are still bound by their duty of confidentiality. This duty extends even after the termination of their employment relationship. Gustav, as an employee directly involved in the development of the new product, is obligated to protect the confidential information he acquired.
Sharing the confidential information with a competitor like Romulus would be a breach of Gustav's obligation to Polycarp and could lead to legal consequences.