Due diligence is a legal concept that refers to: a) The duty owed by a provider to a customer b) Encrypting sensitive information c) Managing network access levels d) Conducting security audits

The correct answer is: a) The duty owed by a provider to a customer. Due diligence is often associated with the obligation to investigate and assess various factors before entering into a business agreement or transaction, ensuring that all relevant information is considered to avoid potential legal issues.